AjaxResponse/validate.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class AjaxResponse_validate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Params["validateType"] != null)
        {
            if (Request.Params["validateType"] == "validateUserName")
            {
                string result = ValidateUserName(Request.Params["loginName"].ToString().Trim());
                WriteToClient(result);
            }
        }
    }
    private void WriteToClient(string result)
    {
        Response.Clear();
        Response.Write(result);
        Response.Flush();
        Response.End();
    }
    private string ValidateUserName(string loginName)
    {
        try
        {
            WebHL.BLL.TBUserInformation validate = new WebHL.BLL.TBUserInformation();
            if (validate.Exists(loginName))
            {
                return "exist";
            }
            else
            {
                return "notexist";
            }
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }
}