.getstudid(id, getstudidSucessCallback); is not function js

hi, how to solve these issue . i tried to find solution but it does not work

here is code below

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebFormstude.aspx.cs" Inherits="webservicesstudent.WebFormstude" %>
"http://www.w3.org/1999/xhtml">
"server">
"text/javascript">
function getstudid() {
debugger
var id = document.getElementById("txtid").value;
webservicesstudent.webservicesstudent.getstudid(id, getstudidSucessCallback);
}
function getstudidSucessCallback(results)
{
debugger
document.getElementById("txtname").value = results["Name"];
document.getElementById("txtgender").value = results["gender"];
document.getElementById("txtmarks").value = results["totalMarks"];
}
"form1" runat="server">
"ScriptManager1" runat="server">
"~/webservicesstudent.asmx" />

Id:	"txtid" runat="server"> "Button1" type="button" value="Getstudent" onclick="getstudid()" />
Name:	"txtname" runat="server">
Gender:	"txtgender" runat="server">
Marks:	"txtmarks" runat="server">

..please share idea

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