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drag one datagrid onto ur form enter the following code.
this is work for column number 2.
If DataGrid1.CurrentCell.ColumnNumber = 2 Then
ComboBox1.Left = DataGrid1.Left + DataGrid1.GetCurrentCellBounds.Left
ComboBox1.Top = DataGrid1.Top + DataGrid1.GetCurrentCellBounds.Top
ComboBox1.Width = DataGrid1.GetCurrentCellBounds.Width
ComboBox1.Visible = True
Else
ComboBox1.Visible = False
End If