asp.net - how to return a datatable if a register number exists -


i trying display grid if user entered register number exists in database, if register number not exists means need display 1 label also.i new 1 in asp.net,so please me. here code below.

public datatable madhrasaviewbyregno(string viewbyno) {     try     {         madhrasainfo infomadhrasa = new madhrasainfo();         object decobj = new object();         if (sqlcon.state == connectionstate.closed)         {             sqlcon.open();         }         sqlcommand sqlcmd = new sqlcommand("madhrasaviewbyregno", sqlcon);         sqlcmd.commandtype = commandtype.storedprocedure;         sqlcmd.parameters.add("@regno", sqldbtype.varchar).value = viewbyno;         decobj = sqlcmd.executenonquery();         if (decobj == null)         {             decstuid = decimal.parse(decobj.tostring());         }         else         {             datatable dtbclass = new datatable();             sqldataadapter sqlda = new sqldataadapter("madhrasaviewbyregno", sqlcon);             sqlda.selectcommand.commandtype = commandtype.storedprocedure;             sqlda.selectcommand.parameters.add("@regno", sqldbtype.varchar).value = viewbyno;             sqlda.fill(dtbclass);             return dtbclass;         }     }     catch (exception)     {         throw;     }     return null; } public void gridfillbyno() {     madhrasasp spmadhrasa = new madhrasasp();     datatable dtbl = new datatable();     dtbl = spmadhrasa.madhrasaviewbyregno(textbox2.text);     gvsturesult.datasource = dtbl;     gvsturesult.databind(); } public void regsearch() {     madhrasasp spmadhrasa = new madhrasasp();     spmadhrasa.madhrasaviewbyregno(textbox2.text);     if (madhrasasp.decstuid > 0)     {         gridfillbyno();         multiview1.activeviewindex = 1;     }     else     {         multiview1.activeviewindex = 0;         label1.visible = true;         label1.text = "invalid register number";     } }  protected void button2_click(object sender, eventargs e)  {     regsearch();    }

you dont set grid view's emptydatatext 'reg no dosent exist'. solve ploblem.


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