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How to change the cell value of datagridview when Datagridview combobox index is changed

Posted on 2010-01-06
Medium Priority
Last Modified: 2012-05-08
II need to display the data in datagridview for my program in vb.net.it has three column and first one is combobox column and second one is textcolumn and third one also combobox.
Depends on the selection of  first combobox ,value of second text column has to be changed and same time third combobox text collection also has to be changed.

How to make changes when first combobox selected index changed in vb.net?

Question by:Nitharsan
  • 2

Expert Comment

ID: 26201497
You need to handle the DataGridView's CellValueChanged event and do something like the following:

    Private Sub myDataGridView_CellValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
    Handles myDataGridView.CellValueChanged

        ' check if column 0 cell has changed
        If e.RowIndex <> -1 AndAlso e.ColumnIndex = 0 Then

            ' change column 1 cell value
            curPartiesRow.Cells(1).Value = someNewValue

        End If

    End Sub

Expert Comment

ID: 26201552
I copied some code incorrectly.  The line

curPartiesRow.Cells(1).Value = someNewValue

should actually be:

myDataGridView.Rows(e.RowIndex).Cells(1).Value = someNewValue


Accepted Solution

Nitharsan earned 0 total points
ID: 26493258
I found a solution...

Private Sub dgBrake_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgBrake.EditingControlShowing

            dgComboBox = TryCast(e.Control, ComboBox)
            If (TypeOf e.Control Is DataGridViewComboBoxEditingControl) Then
                Dim cmb As DataGridViewComboBoxEditingControl = CType(e.Control, DataGridViewComboBoxEditingControl)

                If Not cmb Is Nothing Then
                    RemoveHandler dgComboBox.SelectedIndexChanged, AddressOf Me.dgComboBox_SelectedIndexChanged

                    AddHandler dgComboBox.SelectedIndexChanged, AddressOf Me.dgComboBox_SelectedIndexChanged
                    Exit Sub

                End If
            End If

    End Sub

    Private Sub dgComboBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)

        If rowindex1 = 1 Then
            Dim cmbBox As ComboBox = DirectCast(sender, ComboBox)
            If cmbBox.SelectedIndex = 0 Then
                'Add code here
            ElseIf cmbBox.SelectedIndex = 1 Then
                 'Add code here
            End If
        End If

    End Sub

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