Combobox Error in c#

Hi,

i am using visual studio 2013. when i am try to select combobox values i am this error (Accessviolationexception was unhandled:
(Attempted to read or write protected memory. This is often an indication that other memory is corrupt.)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Data.SqlServerCe;
using System.Threading;

namespace Rpos
{
    static class Program
    {
        ///

        /// The main entry point for the application.
        ///

        [STAThread]
        static void Main()
        {

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new LoginPage());  // i am getting exception in this place (AccessViolationException was unhandled )

        }

    }
}
   


pls help me anyone as soon as possible..........thanks in advance