How do I bind a WPF DataGrid to a variable number of columns

Question

My WPF application generates sets of data which may have a different number of columns each time   Included in the output is a description of each column that will be used to apply formatting   A simplified version of the output might be something like   class Data       IList lt ColumnDescription gt  ColumnDescriptions   get  set        string     Rows   get  set        This class is set as the DataContext on a WPF DataGrid but I actually create the columns programmatically   for  int i   0  i  lt  data ColumnDescriptions Count  i          dataGrid Columns Add new DataGridTextColumn               Header   data ColumnDescriptions i  Name          Binding   new Binding string Format    0     i               Is there any way to replace this code with data bindings in the XAML file instead

User · Answer

You might be able to do this with AutoGenerateColumns and a DataTemplate  I m not positive if it would work without a lot of work  you would have to play around with it  Honestly if you have a working solution already I wouldn t make the change just yet unless there s a big reason  The DataGrid control is getting very good but it still needs some work  and I have a lot of learning left to do  to be able to do dynamic tasks like this easily

User · Answer

I have found a blog article by Deborah Kurata with a nice trick how to show variable number of columns in a DataGrid   Populating a DataGrid with Dynamic Columns in a Silverlight Application using MVVM  Basically  she creates a DataGridTemplateColumn and puts ItemsControl inside that displays multiple columns

User · Answer

You can create a usercontrol with the grid definition and define  child  controls with varied column definitions in xaml    The parent needs a dependency property for columns and a method for loading the columns   Parent     public ObservableCollection lt DataGridColumn gt  gridColumns     get         return  ObservableCollection lt DataGridColumn gt  GetValue ColumnsProperty         set         SetValue ColumnsProperty  value         public static readonly DependencyProperty ColumnsProperty     DependencyProperty Register  gridColumns     typeof ObservableCollection lt DataGridColumn gt      typeof parentControl     new PropertyMetadata new ObservableCollection lt DataGridColumn gt        public void LoadGrid       if  gridColumns Count  gt  0      myGrid Columns Clear       foreach  DataGridColumn c in gridColumns          myGrid Columns Add c           Child Xaml      lt local parentControl x Name  deGrid  gt                lt local parentControl gridColumns gt       lt toolkit DataGridTextColumn Width  Auto  Header  1  Binding   Binding Path       gt       lt toolkit DataGridTextColumn Width  Auto  Header  2  Binding   Binding Path       gt     lt  local parentControl gridColumns gt     lt  local parentControl gt      And finally  the tricky part is finding where to call  LoadGrid   I am struggling with this but got things to work by calling after InitalizeComponent in my window constructor  childGrid is x name in window xaml    childGrid deGrid LoadGrid      Related blog entry

User · Answer

I managed to make it possible to dynamically add a column using just a line of code like this   MyItemsCollection AddPropertyDescriptor      new DynamicPropertyDescriptor lt User  int gt   Age   x   gt  x Age      Regarding to the question  this is not a XAML-based solution  since as mentioned there is no reasonable way to do it   neither it is a solution which would operate directly with DataGrid Columns  It actually operates with DataGrid bound ItemsSource  which implements ITypedList and as such provides custom methods for PropertyDescriptor retrieval  In one place in code you can define  data rows  and  data columns  for your grid   If you would have   IList lt string gt  ColumnNames   get  set      dict key is column name  dict value is value Dictionary lt string  string gt  Rows   get  set      you could use for example   var descriptors  new List lt PropertyDescriptor gt       retrieve column name from preprepared list or retrieve from one of the items in dictionary foreach var columnName in ColumnNames      descriptors Add new DynamicPropertyDescriptor lt Dictionary  string gt  ColumnName  x   gt  x columnName    MyItemsCollection   new DynamicDataGridSource Rows  descriptors     and your grid using binding to MyItemsCollection would be populated with corresponding columns  Those columns can be modified  new added or existing removed  at runtime dynamically and grid will automatically refresh it s columns collection   DynamicPropertyDescriptor mentioned above is just an upgrade to regular PropertyDescriptor and provides strongly-typed columns definition with some additional options  DynamicDataGridSource would otherwise work just fine event with basic PropertyDescriptor

User · Answer

I managed to make it possible to dynamically add a column using just a line of code like this   MyItemsCollection AddPropertyDescriptor      new DynamicPropertyDescriptor lt User  int gt   Age   x   gt  x Age      Regarding to the question  this is not a XAML-based solution  since as mentioned there is no reasonable way to do it   neither it is a solution which would operate directly with DataGrid Columns  It actually operates with DataGrid bound ItemsSource  which implements ITypedList and as such provides custom methods for PropertyDescriptor retrieval  In one place in code you can define  data rows  and  data columns  for your grid   If you would have   IList lt string gt  ColumnNames   get  set      dict key is column name  dict value is value Dictionary lt string  string gt  Rows   get  set      you could use for example   var descriptors  new List lt PropertyDescriptor gt       retrieve column name from preprepared list or retrieve from one of the items in dictionary foreach var columnName in ColumnNames      descriptors Add new DynamicPropertyDescriptor lt Dictionary  string gt  ColumnName  x   gt  x columnName    MyItemsCollection   new DynamicDataGridSource Rows  descriptors     and your grid using binding to MyItemsCollection would be populated with corresponding columns  Those columns can be modified  new added or existing removed  at runtime dynamically and grid will automatically refresh it s columns collection   DynamicPropertyDescriptor mentioned above is just an upgrade to regular PropertyDescriptor and provides strongly-typed columns definition with some additional options  DynamicDataGridSource would otherwise work just fine event with basic PropertyDescriptor

User · Answer

There is a sample of the way I do programmatically   public partial class UserControlWithComboBoxColumnDataGrid   UserControl       private Dictionary lt int  string gt   Dictionary      private ObservableCollection lt MyItem gt   MyItems      public UserControlWithComboBoxColumnDataGrid            Dictionary   new Dictionary lt int  string gt            Dictionary Add 1  A           Dictionary Add 2  B           MyItems   new ObservableCollection lt MyItem gt           dataGridMyItems AutoGeneratingColumn    DataGridMyItems AutoGeneratingColumn        dataGridMyItems ItemsSource    MyItems         private void DataGridMyItems AutoGeneratingColumn object sender  DataGridAutoGeneratingColumnEventArgs e                        var desc   e PropertyDescriptor as PropertyDescriptor              var att   desc Attributes typeof ColumnNameAttribute   as ColumnNameAttribute              if  att    null                                if  att Name     My Combobox Item                         var comboBoxColumn    new DataGridComboBoxColumn                           DisplayMemberPath    Value                           SelectedValuePath    Key                           ItemsSource    ApprovalTypes                          SelectedValueBinding    new Binding   Bazinga                                                  e Column   comboBoxColumn                                                public class MyItem       public string Name get set        ColumnName  My Combobox Item        public int Bazinga  get set        public class ColumnNameAttribute   Attribute               public string Name   get  set            public ColumnNameAttribute string name    Name   name

User · Answer

Here s a workaround for Binding Columns in the DataGrid  Since the Columns property is ReadOnly  like everyone noticed  I made an Attached Property called BindableColumns which updates the Columns in the DataGrid everytime the collection changes through the  CollectionChanged event     If we have this Collection of DataGridColumn s  public ObservableCollection lt DataGridColumn gt  ColumnCollection       get      private set      Then we can bind BindableColumns to the ColumnCollection like this   lt DataGrid Name  dataGrid            local DataGridColumnsBehavior BindableColumns   Binding ColumnCollection             AutoGenerateColumns  False                gt    The Attached Property BindableColumns  public class DataGridColumnsBehavior       public static readonly DependencyProperty BindableColumnsProperty           DependencyProperty RegisterAttached  BindableColumns                                               typeof ObservableCollection lt DataGridColumn gt                                                typeof DataGridColumnsBehavior                                               new UIPropertyMetadata null  BindableColumnsPropertyChanged        private static void BindableColumnsPropertyChanged DependencyObject source  DependencyPropertyChangedEventArgs e                DataGrid dataGrid   source as DataGrid          ObservableCollection lt DataGridColumn gt  columns   e NewValue as ObservableCollection lt DataGridColumn gt           dataGrid Columns Clear            if  columns    null                        return                    foreach  DataGridColumn column in columns                        dataGrid Columns Add column                     columns CollectionChanged     sender  e2    gt                        NotifyCollectionChangedEventArgs ne   e2 as NotifyCollectionChangedEventArgs              if  ne Action    NotifyCollectionChangedAction Reset                                dataGrid Columns Clear                    foreach  DataGridColumn column in ne NewItems                                        dataGrid Columns Add column                                               else if  ne Action    NotifyCollectionChangedAction Add                                foreach  DataGridColumn column in ne NewItems                                        dataGrid Columns Add column                                               else if  ne Action    NotifyCollectionChangedAction Move                                dataGrid Columns Move ne OldStartingIndex  ne NewStartingIndex                             else if  ne Action    NotifyCollectionChangedAction Remove                                foreach  DataGridColumn column in ne OldItems                                        dataGrid Columns Remove column                                               else if  ne Action    NotifyCollectionChangedAction Replace                                dataGrid Columns ne NewStartingIndex    ne NewItems 0  as DataGridColumn                                     public static void SetBindableColumns DependencyObject element  ObservableCollection lt DataGridColumn gt  value                element SetValue BindableColumnsProperty  value             public static ObservableCollection lt DataGridColumn gt  GetBindableColumns DependencyObject element                return  ObservableCollection lt DataGridColumn gt  element GetValue BindableColumnsProperty

User · Answer

There is a sample of the way I do programmatically   public partial class UserControlWithComboBoxColumnDataGrid   UserControl       private Dictionary lt int  string gt   Dictionary      private ObservableCollection lt MyItem gt   MyItems      public UserControlWithComboBoxColumnDataGrid            Dictionary   new Dictionary lt int  string gt            Dictionary Add 1  A           Dictionary Add 2  B           MyItems   new ObservableCollection lt MyItem gt           dataGridMyItems AutoGeneratingColumn    DataGridMyItems AutoGeneratingColumn        dataGridMyItems ItemsSource    MyItems         private void DataGridMyItems AutoGeneratingColumn object sender  DataGridAutoGeneratingColumnEventArgs e                        var desc   e PropertyDescriptor as PropertyDescriptor              var att   desc Attributes typeof ColumnNameAttribute   as ColumnNameAttribute              if  att    null                                if  att Name     My Combobox Item                         var comboBoxColumn    new DataGridComboBoxColumn                           DisplayMemberPath    Value                           SelectedValuePath    Key                           ItemsSource    ApprovalTypes                          SelectedValueBinding    new Binding   Bazinga                                                  e Column   comboBoxColumn                                                public class MyItem       public string Name get set        ColumnName  My Combobox Item        public int Bazinga  get set        public class ColumnNameAttribute   Attribute               public string Name   get  set            public ColumnNameAttribute string name    Name   name

User · Answer

Made a version of the accepted answer that handles unsubscription   public class DataGridColumnsBehavior       public static readonly DependencyProperty BindableColumnsProperty           DependencyProperty RegisterAttached  BindableColumns                                               typeof ObservableCollection lt DataGridColumn gt                                                typeof DataGridColumnsBehavior                                               new UIPropertyMetadata null  BindableColumnsPropertyChanged              lt summary gt Collection to store collection change handlers - to be able to unsubscribe later  lt  summary gt      private static readonly Dictionary lt DataGrid  NotifyCollectionChangedEventHandler gt   handlers       static DataGridColumnsBehavior                  handlers   new Dictionary lt DataGrid  NotifyCollectionChangedEventHandler gt                private static void BindableColumnsPropertyChanged DependencyObject source  DependencyPropertyChangedEventArgs e                DataGrid dataGrid   source as DataGrid           ObservableCollection lt DataGridColumn gt  oldColumns   e OldValue as ObservableCollection lt DataGridColumn gt           if  oldColumns    null                           Remove all columns              dataGrid Columns Clear                    Unsubscribe from old collection              NotifyCollectionChangedEventHandler h              if   handlers TryGetValue dataGrid  out h                                 oldColumns CollectionChanged -  h                   handlers Remove dataGrid                                    ObservableCollection lt DataGridColumn gt  newColumns   e NewValue as ObservableCollection lt DataGridColumn gt           dataGrid Columns Clear            if  newColumns    null                           Add columns from this source              foreach  DataGridColumn column in newColumns                  dataGrid Columns Add column                   Subscribe to future changes              NotifyCollectionChangedEventHandler h       ne    gt  OnCollectionChanged ne  dataGrid                handlers dataGrid    h              newColumns CollectionChanged    h                       static void OnCollectionChanged NotifyCollectionChangedEventArgs ne  DataGrid dataGrid                switch  ne Action                        case NotifyCollectionChangedAction Reset                  dataGrid Columns Clear                    foreach  DataGridColumn column in ne NewItems                      dataGrid Columns Add column                   break              case NotifyCollectionChangedAction Add                  foreach  DataGridColumn column in ne NewItems                      dataGrid Columns Add column                   break              case NotifyCollectionChangedAction Move                  dataGrid Columns Move ne OldStartingIndex  ne NewStartingIndex                   break              case NotifyCollectionChangedAction Remove                  foreach  DataGridColumn column in ne OldItems                      dataGrid Columns Remove column                   break              case NotifyCollectionChangedAction Replace                  dataGrid Columns ne NewStartingIndex    ne NewItems 0  as DataGridColumn                  break                       public static void SetBindableColumns DependencyObject element  ObservableCollection lt DataGridColumn gt  value                element SetValue BindableColumnsProperty  value              public static ObservableCollection lt DataGridColumn gt  GetBindableColumns DependencyObject element                return  ObservableCollection lt DataGridColumn gt  element GetValue BindableColumnsProperty

User · Answer

You might be able to do this with AutoGenerateColumns and a DataTemplate  I m not positive if it would work without a lot of work  you would have to play around with it  Honestly if you have a working solution already I wouldn t make the change just yet unless there s a big reason  The DataGrid control is getting very good but it still needs some work  and I have a lot of learning left to do  to be able to do dynamic tasks like this easily

User · Answer

Made a version of the accepted answer that handles unsubscription   public class DataGridColumnsBehavior       public static readonly DependencyProperty BindableColumnsProperty           DependencyProperty RegisterAttached  BindableColumns                                               typeof ObservableCollection lt DataGridColumn gt                                                typeof DataGridColumnsBehavior                                               new UIPropertyMetadata null  BindableColumnsPropertyChanged              lt summary gt Collection to store collection change handlers - to be able to unsubscribe later  lt  summary gt      private static readonly Dictionary lt DataGrid  NotifyCollectionChangedEventHandler gt   handlers       static DataGridColumnsBehavior                  handlers   new Dictionary lt DataGrid  NotifyCollectionChangedEventHandler gt                private static void BindableColumnsPropertyChanged DependencyObject source  DependencyPropertyChangedEventArgs e                DataGrid dataGrid   source as DataGrid           ObservableCollection lt DataGridColumn gt  oldColumns   e OldValue as ObservableCollection lt DataGridColumn gt           if  oldColumns    null                           Remove all columns              dataGrid Columns Clear                    Unsubscribe from old collection              NotifyCollectionChangedEventHandler h              if   handlers TryGetValue dataGrid  out h                                 oldColumns CollectionChanged -  h                   handlers Remove dataGrid                                    ObservableCollection lt DataGridColumn gt  newColumns   e NewValue as ObservableCollection lt DataGridColumn gt           dataGrid Columns Clear            if  newColumns    null                           Add columns from this source              foreach  DataGridColumn column in newColumns                  dataGrid Columns Add column                   Subscribe to future changes              NotifyCollectionChangedEventHandler h       ne    gt  OnCollectionChanged ne  dataGrid                handlers dataGrid    h              newColumns CollectionChanged    h                       static void OnCollectionChanged NotifyCollectionChangedEventArgs ne  DataGrid dataGrid                switch  ne Action                        case NotifyCollectionChangedAction Reset                  dataGrid Columns Clear                    foreach  DataGridColumn column in ne NewItems                      dataGrid Columns Add column                   break              case NotifyCollectionChangedAction Add                  foreach  DataGridColumn column in ne NewItems                      dataGrid Columns Add column                   break              case NotifyCollectionChangedAction Move                  dataGrid Columns Move ne OldStartingIndex  ne NewStartingIndex                   break              case NotifyCollectionChangedAction Remove                  foreach  DataGridColumn column in ne OldItems                      dataGrid Columns Remove column                   break              case NotifyCollectionChangedAction Replace                  dataGrid Columns ne NewStartingIndex    ne NewItems 0  as DataGridColumn                  break                       public static void SetBindableColumns DependencyObject element  ObservableCollection lt DataGridColumn gt  value                element SetValue BindableColumnsProperty  value              public static ObservableCollection lt DataGridColumn gt  GetBindableColumns DependencyObject element                return  ObservableCollection lt DataGridColumn gt  element GetValue BindableColumnsProperty

User · Answer

You might be able to do this with AutoGenerateColumns and a DataTemplate  I m not positive if it would work without a lot of work  you would have to play around with it  Honestly if you have a working solution already I wouldn t make the change just yet unless there s a big reason  The DataGrid control is getting very good but it still needs some work  and I have a lot of learning left to do  to be able to do dynamic tasks like this easily

User · Answer

I ve continued my research and have not found any reasonable way to do this   The Columns property on the DataGrid isn t something I can bind against  in fact it s read only   Bryan suggested something might be done with AutoGenerateColumns so I had a look   It uses simple  Net reflection to look at the properties of the objects in ItemsSource and generates a column for each one   Perhaps I could generate a type on the fly with a property for each column but this is getting way off track   Since this problem is so easily sovled in code I will stick with a simple extension method I call whenever the data context is updated with new columns   public static void GenerateColumns this DataGrid dataGrid  IEnumerable lt ColumnSchema gt  columns        dataGrid Columns Clear         int index   0      foreach  var column in columns                dataGrid Columns Add new DataGridTextColumn                       Header   column Name              Binding   new Binding string Format    0     index                             E g  myGrid GenerateColumns schema

User · Answer

I have found a blog article by Deborah Kurata with a nice trick how to show variable number of columns in a DataGrid   Populating a DataGrid with Dynamic Columns in a Silverlight Application using MVVM  Basically  she creates a DataGridTemplateColumn and puts ItemsControl inside that displays multiple columns

User · Answer

I ve continued my research and have not found any reasonable way to do this   The Columns property on the DataGrid isn t something I can bind against  in fact it s read only   Bryan suggested something might be done with AutoGenerateColumns so I had a look   It uses simple  Net reflection to look at the properties of the objects in ItemsSource and generates a column for each one   Perhaps I could generate a type on the fly with a property for each column but this is getting way off track   Since this problem is so easily sovled in code I will stick with a simple extension method I call whenever the data context is updated with new columns   public static void GenerateColumns this DataGrid dataGrid  IEnumerable lt ColumnSchema gt  columns        dataGrid Columns Clear         int index   0      foreach  var column in columns                dataGrid Columns Add new DataGridTextColumn                       Header   column Name              Binding   new Binding string Format    0     index                             E g  myGrid GenerateColumns schema

User · Answer

You can create a usercontrol with the grid definition and define  child  controls with varied column definitions in xaml    The parent needs a dependency property for columns and a method for loading the columns   Parent     public ObservableCollection lt DataGridColumn gt  gridColumns     get         return  ObservableCollection lt DataGridColumn gt  GetValue ColumnsProperty         set         SetValue ColumnsProperty  value         public static readonly DependencyProperty ColumnsProperty     DependencyProperty Register  gridColumns     typeof ObservableCollection lt DataGridColumn gt      typeof parentControl     new PropertyMetadata new ObservableCollection lt DataGridColumn gt        public void LoadGrid       if  gridColumns Count  gt  0      myGrid Columns Clear       foreach  DataGridColumn c in gridColumns          myGrid Columns Add c           Child Xaml      lt local parentControl x Name  deGrid  gt                lt local parentControl gridColumns gt       lt toolkit DataGridTextColumn Width  Auto  Header  1  Binding   Binding Path       gt       lt toolkit DataGridTextColumn Width  Auto  Header  2  Binding   Binding Path       gt     lt  local parentControl gridColumns gt     lt  local parentControl gt      And finally  the tricky part is finding where to call  LoadGrid   I am struggling with this but got things to work by calling after InitalizeComponent in my window constructor  childGrid is x name in window xaml    childGrid deGrid LoadGrid      Related blog entry

User · Answer

I ve continued my research and have not found any reasonable way to do this   The Columns property on the DataGrid isn t something I can bind against  in fact it s read only   Bryan suggested something might be done with AutoGenerateColumns so I had a look   It uses simple  Net reflection to look at the properties of the objects in ItemsSource and generates a column for each one   Perhaps I could generate a type on the fly with a property for each column but this is getting way off track   Since this problem is so easily sovled in code I will stick with a simple extension method I call whenever the data context is updated with new columns   public static void GenerateColumns this DataGrid dataGrid  IEnumerable lt ColumnSchema gt  columns        dataGrid Columns Clear         int index   0      foreach  var column in columns                dataGrid Columns Add new DataGridTextColumn                       Header   column Name              Binding   new Binding string Format    0     index                             E g  myGrid GenerateColumns schema

User · Answer

You might be able to do this with AutoGenerateColumns and a DataTemplate  I m not positive if it would work without a lot of work  you would have to play around with it  Honestly if you have a working solution already I wouldn t make the change just yet unless there s a big reason  The DataGrid control is getting very good but it still needs some work  and I have a lot of learning left to do  to be able to do dynamic tasks like this easily

User · Answer

I ve continued my research and have not found any reasonable way to do this   The Columns property on the DataGrid isn t something I can bind against  in fact it s read only   Bryan suggested something might be done with AutoGenerateColumns so I had a look   It uses simple  Net reflection to look at the properties of the objects in ItemsSource and generates a column for each one   Perhaps I could generate a type on the fly with a property for each column but this is getting way off track   Since this problem is so easily sovled in code I will stick with a simple extension method I call whenever the data context is updated with new columns   public static void GenerateColumns this DataGrid dataGrid  IEnumerable lt ColumnSchema gt  columns        dataGrid Columns Clear         int index   0      foreach  var column in columns                dataGrid Columns Add new DataGridTextColumn                       Header   column Name              Binding   new Binding string Format    0     index                             E g  myGrid GenerateColumns schema

User · Answer

Here s a workaround for Binding Columns in the DataGrid  Since the Columns property is ReadOnly  like everyone noticed  I made an Attached Property called BindableColumns which updates the Columns in the DataGrid everytime the collection changes through the  CollectionChanged event     If we have this Collection of DataGridColumn s  public ObservableCollection lt DataGridColumn gt  ColumnCollection       get      private set      Then we can bind BindableColumns to the ColumnCollection like this   lt DataGrid Name  dataGrid            local DataGridColumnsBehavior BindableColumns   Binding ColumnCollection             AutoGenerateColumns  False                gt    The Attached Property BindableColumns  public class DataGridColumnsBehavior       public static readonly DependencyProperty BindableColumnsProperty           DependencyProperty RegisterAttached  BindableColumns                                               typeof ObservableCollection lt DataGridColumn gt                                                typeof DataGridColumnsBehavior                                               new UIPropertyMetadata null  BindableColumnsPropertyChanged        private static void BindableColumnsPropertyChanged DependencyObject source  DependencyPropertyChangedEventArgs e                DataGrid dataGrid   source as DataGrid          ObservableCollection lt DataGridColumn gt  columns   e NewValue as ObservableCollection lt DataGridColumn gt           dataGrid Columns Clear            if  columns    null                        return                    foreach  DataGridColumn column in columns                        dataGrid Columns Add column                     columns CollectionChanged     sender  e2    gt                        NotifyCollectionChangedEventArgs ne   e2 as NotifyCollectionChangedEventArgs              if  ne Action    NotifyCollectionChangedAction Reset                                dataGrid Columns Clear                    foreach  DataGridColumn column in ne NewItems                                        dataGrid Columns Add column                                               else if  ne Action    NotifyCollectionChangedAction Add                                foreach  DataGridColumn column in ne NewItems                                        dataGrid Columns Add column                                               else if  ne Action    NotifyCollectionChangedAction Move                                dataGrid Columns Move ne OldStartingIndex  ne NewStartingIndex                             else if  ne Action    NotifyCollectionChangedAction Remove                                foreach  DataGridColumn column in ne OldItems                                        dataGrid Columns Remove column                                               else if  ne Action    NotifyCollectionChangedAction Replace                                dataGrid Columns ne NewStartingIndex    ne NewItems 0  as DataGridColumn                                     public static void SetBindableColumns DependencyObject element  ObservableCollection lt DataGridColumn gt  value                element SetValue BindableColumnsProperty  value             public static ObservableCollection lt DataGridColumn gt  GetBindableColumns DependencyObject element                return  ObservableCollection lt DataGridColumn gt  element GetValue BindableColumnsProperty

[c#] How do I bind a WPF DataGrid to a variable number of columns?

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