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Programmatically add rows to a bound Datagridview

Posted on 2011-03-13
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Last Modified: 2012-05-11
Every where I have looked indicates that you can not programmatically add rows to a bound datagridview.( I want to add total rows at the bottom of a grid that the datasource is being set = to a datatable.) Is this true? If so, what are other ideas for a work around?

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Question by:windlust
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Expert Comment

by:alsam
ID: 35123436
Hi,
In order to add total row at the end of bound datagridview you can use CellPainting...
Here you can find an example how you could make this working for you...

Since I don't know the structure of your data you are loading into your datagridview you can play with column index to set from which colum you want to calculate totals....
In case below totals are calculated starting from column 3 (e.ColumnIndex > 1)...
Also, cell painting will provide your end users only with information about totals but will not be updated against your database in case you want to save changes (this is not bound to original data source...)...
Hope to help...
Alsam
Public Sub DataGridView1_CellPainting(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellPaintingEventArgs) Handles DataGridView1.CellPainting

        Dim sum As Decimal = 0.0
        If (e.RowIndex = DataGridView1.NewRowIndex And e.ColumnIndex > 1) Then
            For i As Integer = 0 To DataGridView1.NewRowIndex - 1
                If (DataGridView1.Rows(i).Cells(e.ColumnIndex).Value.ToString().Trim() <> "") Then
                    sum += Convert.ToDecimal(DataGridView1.Rows(i).Cells(e.ColumnIndex).Value)
                End If
            Next i

            e.PaintBackground(e.CellBounds, False)
            e.Graphics.DrawString(sum.ToString(), DataGridView1.Font, Brushes.Black, e.CellBounds.Left + 2, e.CellBounds.Top + 2)
            e.Handled = True
        End If
    End Sub

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Author Comment

by:windlust
ID: 35158750
Thanks,

I use the cellpainting event for formatting columns but I could not understand how to call the cellpainting event and tell it to re-paint specific cells. Specifically I would like to call it from a Cell Changed event and pass over specific cell info to repaint. How would i do this?
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Accepted Solution

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alsam earned 500 total points
ID: 35169294
Hi,
In order to refresh your totals after cell value changed I suggest you to use code bellowe I have just tested in order to bring solution to you...
I dont suggest you to try to call cellpainting....
Let m know if this is ok with your requirements...If not than we should try find different solution for you
Hope to help
Alsam
Private Sub DataGridView1_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged
                Dim sum As Decimal = 0.0
        If (e.RowIndex <> DataGridView1.NewRowIndex And e.ColumnIndex > 1) Then
            For i As Integer = 0 To DataGridView1.NewRowIndex - 1
                If (DataGridView1.Rows(i).Cells(e.ColumnIndex).Value.ToString().Trim() <> "") Then
                    sum += Format(Convert.ToDouble(DataGridView1.Rows(i).Cells(e.ColumnIndex).Value), "0.00")
                End If
            Next i

        End If

        DataGridView1.Rows(DataGridView1.NewRowIndex).Cells(e.ColumnIndex).Value = sum
    End Sub

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