Question

Is there any chance of adding a calculated column (a complex calculation, not possible to calculate in SQL) on a DataGridView (WinForms – vb.NET)?

I was hoping something like when I have in ASP.NET the RowDataBound Event of GridView control, but the way of link data of asp and vb are way too different.

Answer 1

To do this you can add an unbound column to the grid:

Dim col As New DataGridViewTextBoxColumn
col.Name = "Unbound"
DataGridView1.Columns.Add(col)

And place the grid in VirtualMode:

DataGridView1.VirtualMode = True

Then use a handler for the CellValueNeeded event:

Private Sub CellValueNeeded(sender As System.Object, e As DataGridViewCellValueEventArgs) Handles DataGridView1.CellValueNeeded
    If DataGridView1.Columns(e.ColumnIndex).Name = "Unbound" Then
        e.Value = "Hi"
    End If
End Sub

In the handler above I just set the value to something trivial but you can add any calculation you like here.