DataGridView Clear

Question

Here comes the trouble  I want to delete all rows from datagridview  This how i add rows   private void ReadCompleteCallback object clientHandle  Opc Da ItemValueResult       results        foreach  Opc Da ItemValueResult readResult in results                dataGridView1 Invoke new MethodInvoker      gt  dataGridView1 Rows Add readResult ItemName  readResult Quality  readResult Timestamp readResult Value                                                     And its how i clear gridview   private void treeView1 SelectionsChanged object sender  EventArgs e        dataGridView1 Rows Clear        items   new Opc Da Item treeView1 SelectedNodes Count        foreach  TreeNode x in treeView1 SelectedNodes            items treeView1 SelectedNodes IndexOf x     new Opc Da Item            items treeView1 SelectedNodes IndexOf x   ItemName   x Text              group AddItems items       group Read group Items  123  new Opc Da ReadCompleteEventHandler ReadCompleteCallback   out req       in debug i see that dataGridVIew1 Rows Count 0  but on form  grid doesnt become clear  what a point  on each selection in tree  i want to see new rows in table

User · Answer

I have this piece of code i hope it may help u   int numRows   dgbDatos Rows Count      for  int i   0  i  lt  numRows  i          try                   int max   dgbDatos Rows Count - 1          dgbDatos Rows Remove dgbDatos Rows max               catch  Exception exe                MessageBox Show  You can  t delete A row     exe   WTF           MessageBoxButtons OK  MessageBoxIcon Information

User · Answer

I m betting you just need to refresh the datagrid  Try this   dataGridView1 Rows Clear    dataGridView1 Refresh      If this works    you might want to rethink this part of your application

User · Answer

all you need to do is clear your datatable before you fill it    and then just set it as you dgv s datasource

User · Answer

Basically below code line is only useful in data binding scenarios  datagridview DataSource   null     otherwise below is the used when no data binding and datagridview is populated manually  dataGridView1 Rows Clear    dataGridView1 Refresh      So  check first what you are doing

User · Answer

If you want clear a dataGridView not binded to DataSource but manually loaded you can use this simple code   datagridview Rows Clear    datagridview Columns Clear

User · Answer

This is one way of doing it   datagridview DataSource   null  datagridview Refresh      I hope it works for you because it is working for me

User · Answer

Try this Method  dataGridView1 DataSource   dt  dt Rows Clear

User · Answer

To clear the datagridview write the following code   dataGridView1 DataSource null

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dataGridView1 DataSource null

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Try this   DataGridView1 DataSource ds  ds Clear

User · Answer

If I remember correctly  I set the DataSource property to null to clear the DataGridView     datagridview DataSource   null

User · Answer

try setting RowCount to 0 allowuserstorows should be false   along with calling clear

User · Answer

try   datagrid DataSource   null  datagrid DataBind      Basically you will need to clear the datasource your binding to the grid

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Simply if your are trying to rebind your Data Grid View just code this    DataGridView1 DataSource   DataSet Tables  TableName      OR  DataGridView DataSource   DataTable    else if you trying to to clear your Data Grid View just code this   DataGridView DataSource   null  DataGridView Rows Clear    DataGridView Refresh      and add any method or event to bind Data Grid View Again below this line of code

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Try this Code   private void button Click object sender  EventArgs e        if  this dgInv DataSource    null            this dgInv DataSource   null        else           this dgInv Rows Clear

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If your DataGridView does not have any DataSource the solution does not come by manipulating it   You will always have an empty row if you have the AllowUserToAddRows property set to true   Put AllowUserToAddRows   false if you don t need permise this

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I don t like messing with the DataSource personally so after discussing the issue with an IT friend I was able to discover this way which is simple and doesn t effect the DataSource  Hope this helps   foreach  DataGridViewRow row in dataGridView1 Rows         foreach  DataGridViewCell cell in row Cells                cell Value

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I know it sounds crazy  but I solved this issue by changing the datagrid visible property to false and then to true  It causes a very small blink  but it works for me  at least for now

User · Answer

Set the datasource property to an empty string then call the Clear method

[c#] DataGridView.Clear()

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