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VB.net adding ComboBox columns to a DataGridView that can accept text

Posted on 2012-04-09
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Last Modified: 2012-04-09
Hi. I am using the following loop to add over two hundred columns to a DataGridView.
I need to programatically set the text value of any of the cells to something but get an error when I do this. How can I change my code so that text can be dropped in too?          


  Dim xx As New DataGridViewComboBoxColumn

        For i as integer = 0 to UBound(arrHeaders)

            xx.Name = arrHeaders(i)

            xx.Items.Add("Yes")

            xx.Items.Add("No")

            Me.DataGridView1.Columns.Add(xx)


        Next I
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Question by:Murray Brown
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4 Comments
 
LVL 17

Expert Comment

by:nepaluz
ID: 37824104
Simply do:
For i As Integer = 0 To UBound(arrHeaders)
    Me.DataGridView1.Columns.Add(New DataGridViewComboBoxColumn With {.DataSource = {"Yes", "No"}, .Name = arrHeaders(i)})
Next i

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Author Comment

by:Murray Brown
ID: 37824123
Hi. Thanks, but if I try and change the text to something that isn't in the list of ComboBox items I get an error
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LVL 17

Accepted Solution

by:
nepaluz earned 2000 total points
ID: 37824158
Ahhh! you need to hande the CellValidating event of your datagridview to add thenew item. Add the following code (assuming you datagridviewis called DataGridView1)
If DataGridView1.CurrentCell.IsInEditMode Then
    If TypeOf (DataGridView1.CurrentCell) Is DataGridViewComboBoxCell Then
        If String.IsNullOrEmpty(e.FormattedValue.ToString) Then Exit Sub
        Dim cb = DirectCast(DataGridView1.CurrentCell, DataGridViewComboBoxCell)
        If Not cb.Items.Contains(e.FormattedValue) Then
            cb.Items.AddRange(e.FormattedValue)
            cb.Value = e.FormattedValue
        End If
    End If
End If

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NOTE: I additionally assume that you have already enabled editing on your datagridviewcomboboxcell!)
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Author Closing Comment

by:Murray Brown
ID: 37824204
fantastic. Thanks very much
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