It was a requirment in one of my projects, that we have to show sort images alongwith header text, so I googled the problem and find a solution, but solution was not generic, so I did some tweaks with it and the outcome is a generic function to show sort images in your GridView header alongwith column text.
So here goes the functions...................~
C#
void GridViewSortImages(object sender, GridViewRowEventArgs e)
{ GridView senderGridView = (GridView) sender; Literal space = new Literal; space.Text = " ";
if (e.Row!= null && e.Row.RowType == DataControlRowType.Header)
{
foreach (TableCell cell in e.Row.Cells)
{
if (cell.HasControls)
{
LinkButton button = cell.Controls[0] as LinkButton;
if (button!= null)
{
Image image = new Image;
image.ImageUrl = "default.gif";
if (senderGridView.SortExpression == button.CommandArgument)
{
if (senderGridView.SortDirection == SortDirection.Ascending)
image.ImageUrl = "asc.gif";
else
image.ImageUrl = "desc.gif";
}
cell.Controls.Add(image);
}
}
}
}
}
VB.NET
Sub GridViewSortImages(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Dim senderGridView As GridView = CType(sender, GridView) Dim space As New Literal space.Text = " "
If Not (e.Row Is Nothing) AndAlso e.Row.RowType = DataControlRowType.Header Then For Each cell As TableCell In e.Row.Cells If cell.HasControls Then Dim button As LinkButton = CType((cell.Controls(0)), LinkButton) If Not (button Is Nothing) Then Dim image As New System.Web.UI.WebControls.Image image.ImageUrl = "\images\clear.gif" If senderGridView.SortExpression = button.CommandArgument Then If senderGridView.SortDirection = SortDirection.Ascending Then image.ImageUrl = "\images\glyphs\arrow_down.gif" Else image.ImageUrl = "\images\glyphs\arrow_up.gif" End If End If cell.Controls.Add(image) End If End If Next End If End Sub
You can use this code by simply binding GridView's RowCreated event.
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Happy Coding:)