protected void btnTesters_Click(object sender, EventArgs e)
{
if (hdnFirstPage.Value == "1")
{
hdnFirstPage.Value = "0";
CurrentPage = 1;
Asc = true;
SortExpression = "SortNumber";
// clear cache
HttpContext context = HttpContext.Current;
context.Cache.Remove("TestersInfo");
}
BindTesters();
}