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Session["SortTable"] = table; //From Which table  data you are going to bind in gridview  keep that table data in session. protected void gvtest_Sorting1(object sender, GridViewSortEventArgs e)     {         try         {             GridView grid = (GridView)sender;             ViewState["sortexpression"] = e.SortExpression;             if (ViewState["sortdirection"] == null)             {                 ViewState["sortdirection"] = "asc";             }             else    ...