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ASP.NET將GridView表頭排序加上方向--vb.net

Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated

'GridView1.SortExpression.ToString()

If (e.Row.RowType = DataControlRowType.Header) Then

Dim myheader As TableCell


For Each myheader In e.Row.Cells '對每一格


If (myheader.HasControls()) Then
Dim LinkButton As LinkButton = myheader.Controls(0)


If LinkButton.CommandArgument = GridView1.SortExpression Then

'否為為排序欄位(myheader.Controls(0))

If (GridView1.SortDirection = SortDirection.Ascending) Then '依排序方向加入箭號
myheader.Controls.Add(New LiteralControl("▼"))
Else
myheader.Controls.Add(New LiteralControl("▲"))
End If
Else
If GridView1.SortExpression = "" And pag = 0 Then
If (GridView1.SortDirection = SortDirection.Ascending) Then '依排序方向加入箭號
myheader.Controls.Add(New LiteralControl("▼"))
Else
myheader.Controls.Add(New LiteralControl("▲"))
End If
pag = 1
End If
End If
End If
Next
End If



End Sub