[RESOLVED] Setting Image Button URL in code behind

[wild_bill]

I thought this would be a simple issue, but I've been struggling. I created an image button in my header template. When clicked, it calls the Sorting method. When I change the image url in code behind, it does not render. By setting a break point, I can see the property being updated, but I assume it is getting overridden by the default I set in the HTML page.

                    <HeaderTemplate>
                        <span>Claim Id</span>
                        <asp:ImageButton ID="btnClaimIdSort" runat="server" ImageUrl="~/Styles/UpArrow.ico" OnClick="Sorting" ToolTip="ClaimId" />
                    </HeaderTemplate>

        protected void Sorting(object sender, EventArgs e)
         {
             var sortButton = (ImageButton)sender;

             // parse new sort
             var newField = sortButton.ToolTip;
             
             // parse existing sort
             var existingSortArgs = this.ClaimSort.Split(' ');
             var existingField = existingSortArgs[0];
             var existingDirection = existingSortArgs[1];

             if (string.Compare(newField, existingField,true) == 0)
             {
                 // swap direction
                 var newDirection = (existingDirection == "Asc" ? "Desc" : "Asc");
                 sortButton.ImageUrl = (newDirection == "Asc" ? "~/Styles/DownArrow.ico" : "~/Styles/UpArrow.ico");
                 this.ClaimSort = string.Format("{0} {1}", existingField, newDirection);
             }
             else
             {
                 sortButton.ImageUrl = "~/Styles/UpArrow.ico";
                 this.ClaimSort = string.Format("{0} Asc", newField);
             }

             // rebind data
             this.BindResultsGrid();
         }