asp.net用户注册程序

asp教程.net用户注册程序
asp教程x.cs" inherits="register" %>

var msg = eval(data);
if (msg == 1) {
$("#spanusercode").html('sorry该用户名已经存在！');
$("#btnregister").hide();

} else {
$("#spanusercode").html('恭喜您该用户名可以使用！');

$("#btnregister").show();
}
})
return result;
}

会员注册：以下*标记的为必填项
会员名：	--%> * controltovalidate="txtusercode" errormessage="会员名称不能为空！">
密码：	* controltovalidate="txtpwd" errormessage="密码不能为空！">
确认密码：	* controltocompare="txtpwd" controltovalidate="txtpwd1" errormessage="两次密码输入不一致！">
真实姓名：	* id="requiredfieldvalidator2" runat="server" controltovalidate="txttruename" errormessage="姓名不能为空！">
onclick="btnregister_click" />

后台：

protected void btnregister_click(object sender, eventargs e)
{
string usercode = txtusercode.text.trim();
string userpwd = common.getmd5(txtpwd.text.trim());
string username = txttruename.text;
string sql = string.empty;

stringbuilder sb = new stringbuilder();
sb.append("insert into nw_admin(nw_usercode,nw_pwd,nw_username,nw_class)");
sb.append("values('" + usercode + "','" + userpwd + "','" + username + "',0)");
int temp = sqlhelp.executesql(sb.tostring());
if (temp > 0)
common.jsredirect("注册成功！", "questionlist.aspx");
}
%>
//ashx文件：作为服务器与数据库教程交互，js传过来的用户名

using system;
using system.web;

public class register : ihttphandler {

public void processrequest (httpcontext context) {
context.response.contenttype = "text/plain";
if (!string.isnullorempty(context.request["usercode"]))
{
string usercode = context.request["usercode"].tostring();
string sql = "select count(1) from nw_admin where nw_usercode='"+usercode.trim()+"'";
bool result = sqlhelp.exists(sql);
if (result)
context.response.write(1);
else
context.response.write(0);
}
}

public bool isreusable {
get {
return false;
}
}

}
%》