AjaxService.aspx.cs:行号 23报错

shelf123

demo/data/AjaxService.aspx?method=SearchEmployees
servererror

   在 System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)

   在 System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)

   在 System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

   在 System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)

   在 demo_data_AjaxService.Page_Load(Object sender, EventArgs e) 位置 f:\asptest\Test\Test\demo\data\AjaxService.aspx.cs:行号 23

请版主帮忙看看是啥问题