This would be fantastic !

In the normal old winform datagridview it was simply possible by "SortCompare".. i would like to buy the radgridview but as far as this is not availabel, i cant.. my customers need it.

 

anyway old solution was :

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    Private Sub DG_RM_SortCompare(sender As Object, e As DataGridViewSortCompareEventArgs) Handles DG_RM.SortCompare

        '''' <summary>Gets or sets a value indicating the order in which the compared cells will be sorted.</summary>
        '''' <returns>Less than zero if the first cell will be sorted before the second cell; zero if the first cell and second cell have equivalent values; greater than zero if the second cell will be sorted before the first cell.</returns>

        If e.Column.Index > 2 Then
            Try
                If e.CellValue1 Is Nothing OrElse e.CellValue1.Equals(DBNull.Value) Then
                    If e.CellValue2 Is Nothing OrElse e.CellValue2.Equals(DBNull.Value) Then
                        e.SortResult = 0
                    Else
                        e.SortResult = 1
                    End If
                Else
                    If e.CellValue2 Is Nothing OrElse e.CellValue2.Equals(DBNull.Value) Then
                        e.SortResult = -1
                    Else
                        e.SortResult = DirectCast(e.CellValue1, IComparable).CompareTo(DirectCast(e.CellValue2, IComparable))
                    End If
                End If
                e.Handled = True

            Catch ex As Exception
                MsgBox(Err.Description)
                Close()
            End Try
        End If

    End Sub