To set the widht of a column on a GridView in ASP.NET you can hook inot the RowDataBound event.

This code detects the header line (datacontrolrowtype.header) and then hooks in to set the width of the columns. Instead of percentages you can use any Unit.* measure you like (pixels, mm)


    Private Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

        If e.Row.RowType = DataControlRowType.Header Then
            e.Row.Cells(0).Width = Unit.Percentage(10)
            e.Row.Cells(1).Width = Unit.Percentage(20) 
            e.Row.Cells(2).Width = Unit.Percentage(10)
            e.Row.Cells(3).Width = Unit.Percentage(60)
        End If

    End Sub

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