访问WebService

//客户端代码WebServiceAccess.aspx

  <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
            <Services>
                <asp:ServiceReference Path="EmployeeService.asmx" />
            </Services>
        </asp:ScriptManager>
        
        <script language="javascript" type="text/javascript">
            function showEmployee(firstName, lastName, title)
            {   //Web服务的完整地址
                AspNetAjaxOverview.EmployeeService.GetEmployee(
                    firstName,
                    lastName,
                    title,
                    onGetEmployeeSuccess);
            }
            //成功回调函数
            function onGetEmployeeSuccess(employee)
            {
                alert(String.format(
                    "Hello I'm {0} {1}, my title is '{2}'",
                    employee.FirstName,
                    employee.LastName,
                    employee.Title));
            }
        </script>
        
        <input type="button" value="Bill Gates"
            onclick="showEmployee('Bill', 'Gates', 'Chair man')" />
        <input type="button" value="Steve Ballmer"
            onclick="showEmployee('Steve', 'Ballmer', 'CEO')" />
    </form>

//服务器端代码EmployeeService.asmx

using System.Web.Script.Services;

namespace AspNetAjaxOverview
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ScriptService]
    public class EmployeeService : System.Web.Services.WebService
    {
        [WebMethod]
        [ScriptMethod]
        public Employee GetEmployee(string firstName, string lastName, string title)
        {
            return new Employee(firstName, lastName, title);
        }
    }
}