WebUI/present/Ajaxcheck.aspx.cs

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namespace hyst.present
{
    using DBUtility;
    using System;
    using System.Web.UI;

    public class Ajaxcheck : Page
    {
        private BaseClass bc = new BaseClass();

        protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                string sqlf = "select gId from present where gNum ='" + base.Request.QueryString["gnum"].ToString() + "'";
                if (this.bc.ReadTable(sqlf).Rows.Count > 0)
                {
                    base.Response.Write("false");
                }
                else
                {
                    base.Response.Write("true");
                }
            }
            catch
            {
                base.Response.Write("false");
            }
        }
    }
}