How to filter Gridview on Textbox text Changing value using Ajax

=============== The code below works when columns are created explicitly as declerative >><asp:BoundField DataField="ID" HeaderText="ID" SortExpression="" /> =============== AllowSorting ="True" OnSorting ="GvEvent_Sorting" < asp:TemplateField ItemStyle-HorizontalAlign="Right" HeaderText="MyDate" SortExpression ="MyDate"> #region GV_sort event and Sort Direction protected void GvEvent_Sorting(object sender, GridViewSortEventArgs e) { //Retrieve the table from the session object. DataTable dt = Session["MyDS"] as DataTable; if (dt != null) { //Sort the data. dt.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression); GridView Gv = (GridView)sender; Gv.DataSource = Session["MyDS"]; Gv.DataBind(); } } private string GetSortDirection(string column) { // By default, set the sort direction to ascending. string sortDirection = "ASC"; // Retrieve the last column that was sorted. string sortExpression = ViewState["SortExpression"] as string; if (sortExpression != null) { // Check if the same column is being sorted. // Otherwise, the default value can be returned. if (sortExpression == column) { string lastDirection = ViewState["SortDirection"] as string; if ((lastDirection != null) && (lastDirection == "ASC")) { sortDirection = "DESC"; } } } // Save new values in ViewState. ViewState["SortDirection"] = sortDirection; ViewState["SortExpression"] = column; return sortDirection; } #endregion