javascript - stopping a server side function in c# -

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my code : 

<asp:linkbutton id="search" cssclass="button" runat="server" text='<%$resources:strings,search %>' onclick="search_click"  />

server side :

protected void search_click(object sender, eventargs e) {     var script = "checkifitemselected()";     scriptmanager.registerstartupscript(this, gettype(), "myscript", script, true); }

client side : 

function checkifitemselected() {         var salesmanselecteditem = $find('<%= salesmangrid_grd.clientid %>').get_mastertableview().get_selecteditems().length;         var productsselecteditem = $find('<%= salsemanproductsgrid_grd.clientid %>').get_mastertableview().get_selecteditems().length;          if (salesmanselecteditem == 0 && productsselecteditem == 0) {              $("#<%=errormsg.clientid %>").html("please select salesman @ least<br>please select product @ least");             return false;         }         if (salesmanselecteditem == 0) {             $("#<%=errormsg.clientid %>").html("please select salesman @ least");             return false ;         }         if (productsselecteditem == 0) {             $("#<%=errormsg.clientid %>").html("please select product @ least");             return false;         }         $("#<%=errormsg.clientid %>").html("");         return true;     }

the question if client side function return false want stop server side function continue how should ?

found solution hope wld :

 protected void search_click(object sender, eventargs e) {   int selectedsalesmans=  salesmangrid_grd.selecteditems.count;   int selectedproducts = salsemanproductsgrid_grd.selecteditems.count;   if (selectedsalesmans == 0)   {       var script = "displayerrormsg(\"please choose salesman @ least. \")";       scriptmanager.registerstartupscript(this, gettype(), "myscript", script, true);       return;   }   if (selectedproducts == 0)   {       var script = "displayerrormsg(\"please choose product @ least. \")";       scriptmanager.registerstartupscript(this, gettype(), "myscript", script, true);       return;   } }

client side:

function displayerrormsg(msg) {         $("#<%=errormsg.clientid %>").html(msg);     }

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