Programmatically add new column to DataGridView

Question

I have a DataGridView bound to a DataTable  The DataTable is populated from a database query  The table contains a column named BestBefore  BestBefore is a date formatted as a string  SQLite doesn t have date types     I would like to programmatically add a new column to the DataGridView called Status  If BestBefore is less than the current date  Status value should be set to OK  otherwise Status value should be set to NOT OK   I m very new to Winforms  so some example code would be greatly appreciated   UPDATE   I think DataColumn Expression is okay for doing simple calculations such multiplying a column s integer value by another value  but what about doing what I need to do  That is  calculate the difference between now and the date  string formatted  in the BestBefore column to determine what value to give the new status column  Example code would be appreciated

User · Answer

Keep it simple  dataGridView1 Columns Add  newColumnName    Column Name in Text      To add rows  dataGridView1 Rows Add  Value for column 1          column 2

User · Answer

Here s a sample method that adds two extra columns programmatically to the grid view       private void AddColumnsProgrammatically                    I created these columns at function scope but if you want to access             easily from other parts of your class  just move them to class scope             E g  Declare them outside of the function            var col3   new DataGridViewTextBoxColumn            var col4   new DataGridViewCheckBoxColumn             col3 HeaderText    Column3           col3 Name    Column3            col4 HeaderText    Column4           col4 Name    Column4            dataGridView1 Columns AddRange new DataGridViewColumn    col3 col4            A great way to figure out how to do this kind of process is to create a form  add a grid view control and add some columns   This process will actually work for ANY kind of form control  All instantiation and initialization happens in the Designer   Then examine the form s Designer cs file to see how the construction takes place   Visual Studio does everything programmatically but hides it in the Form Designer    For this example I created two columns for the view named Column1 and Column2 and then searched Form1 Designer cs for Column1 to see everywhere it was referenced  The following information is what I gleaned and  copied and modified to create two more columns dynamically      Note that this info scattered throughout the designer but can easily collected           System Windows Forms DataGridViewTextBoxColumn Column1          System Windows Forms DataGridViewCheckBoxColumn Column2           this Column1   new System Windows Forms DataGridViewTextBoxColumn            this Column2   new System Windows Forms DataGridViewCheckBoxColumn             this dataGridView1 Columns AddRange new System Windows Forms DataGridViewColumn             this Column1          this Column2             this Column1 HeaderText    Column1           this Column1 Name    Column1            this Column2 HeaderText    Column2           this Column2 Name    Column2

User · Answer

Add new column to DataTable and use column Expression property to set your Status expression   Here you can find good example  DataColumn Expression Property  DataTable and DataColumn Expressions in ADO NET - Calculated Columns  UPDATE  Code sample   DataTable dt   new DataTable    dt Columns Add new DataColumn  colBestBefore   typeof DateTime     dt Columns Add new DataColumn  colStatus   typeof string      dt Columns  colStatus   Expression   String Format  IIF colBestBefore  lt    0     Ok   Not ok     DateTime Now ToString  yyyy-MM-dd HH mm ss      dt Rows Add DateTime Now AddDays -1    dt Rows Add DateTime Now AddDays 1    dt Rows Add DateTime Now AddDays 2    dt Rows Add DateTime Now AddDays -2     demoGridView DataSource   dt    UPDATE  2  dt Columns  colStatus   Expression   String Format  IIF CONVERT colBestBefore   System DateTime    lt    0     Ok   Not ok     DateTime Now ToString  yyyy-MM-dd HH mm ss

[c#] Programmatically add new column to DataGridView

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