WebSite/Handlers/check.aspx.cs

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using Microsoft.Win32;
using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;
namespace checkEnvirent
{


    public partial class check : Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            string strMethod = base.Request["method"].ToString();
            if ((strMethod != null) && (strMethod == "check"))
            {
                try
                {
                    string ip = base.Request.ServerVariables.Get("Local_Addr").ToString();
                    RegistryKey itemReg = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\.NETFramework\v4.0.30319");
                    RegistryKey itemReg1 = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4");
                    base.Response.Clear();
                    if ((itemReg != null) || (itemReg1 != null))
                    {
                        base.Response.Write("y:" + ip);
                    }
                    else
                    {
                        base.Response.Write("n");
                    }
                }
                catch (Exception)
                {
                    base.Response.Write("n");
                }
                base.Response.Clear();
            }
        }
    }
}