private void GetResourceSet()
{
    this.ResourceSet = Request.Form[this.lstResourceSet.UniqueID];
    if (ResourceSet == null)
        this.ResourceSet = Request.QueryString["ResourceSet"];
    if (this.ResourceSet == null)
        this.ResourceSet = ViewState["ResourceSet"] as string;
 
    if (this.ResourceSet == null)
        this.ResourceSet = "";