Windows Forms FAQ resources

5. Windows Forms Datagrid

5.80 How can I get a CheckBox column in a DataGrid to react to the first click?

When you first click into a checkbox column, the checked state of the cell does not change. One way you can make the checked state change on the first click is to handle the grid's MouseUp event, and change the check value there.

[VB.Net}

Private myCheckBoxCol As Integer = 9 'my checkbox column

Private Sub DataGrid2_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles DataGrid2.MouseUp

Dim hti As DataGrid.HitTestInfo = Me.dataGrid2.HitTest(e.X, e.Y)

Try

If hti.Type = DataGrid.HitTestType.Cell AndAlso hti.Column = myCheckBoxCol Then

Me.dataGrid2(hti.Row, hti.Column) = Not CBool(Me.dataGrid2(hti.Row, hti.Column))

End If

Catch ex As Exception

MessageBox.Show(ex.ToString())

End Try

End Sub 'dataGrid2_MouseUp

[C#]

private int myCheckBoxCol = 9; //my checkbox column

private void dataGrid2_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)

{

DataGrid.HitTestInfo hti = this.dataGrid2.HitTest(e.X, e.Y);

try

{

if( hti.Type == DataGrid.HitTestType.Cell &&

hti.Column == myCheckBoxCol)

{

this.dataGrid2[hti.Row, hti.Column] = ! (bool) this.dataGrid2[hti.Row, hti.Column];

}

} catch(Exception ex)

{

MessageBox.Show(ex.ToString());

}