Put image condition on a row of my gridview

It used to work like this but since I used itexsharp to generate a pdf, I set myself wrong and now I do not know how to correct it ..

If e.Row.RowType = DataControlRowType.DataRow Then
            If e.Row.Cells(6).Text.ToString = "True" Then
                Dim img As New Image
                img.ImageUrl = "~/Imagenes/Iconos_menus/Correcion.png"
                e.Row.Cells(6).Controls.Add(img)
            Else
                e.Row.Cells(6).Text = ""
            End If