singleton class throwing name doesn't existing, error

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C#3.5

singleton

XMPP

Hi iam trying an xmpp connection using singleton class,but a methode and a variable(isxmppsuccess) showing errors.My textboxes also throwing error!
how i can maintain the connection in next page also?

i am new to the singleton
below mentioned is my full code and second one is error lines:



my full code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using WP8Xmpp.Resources;
using System.Net.XMPP;
using System.Threading;

namespace WP8Xmpp
{
    public partial class MainPage : PhoneApplicationPage
    {

        public MainPage()
        {
            InitializeComponent();

        }




        private static XMPPClient ObjXmppClient;



        public class singleton

        {


            private static singleton instance;

            private static XMPPConnection ObjXmppCon;

             private Boolean IsXmppSuccess { get; set; }

            public String UserName { get; set; }

            public String PassWord { get; set; }

            private readonly String Server = "taurus";


            private readonly String ServerIPAddress = "127.0.0.1:9090";//127.0.0.1:9090/

            private singleton()
            {


            }

            public static singleton GetInstance()
            {


                if (instance == null)
                {

                    instance = new singleton();


                }
                return instance;
            }



            public static void IsXmppValid(string UserName, string PassWord)
            {


                ObjXmppClient = new XMPPClient();
                ObjXmppClient.JID = UserName + "@" + instance.Server;
                ObjXmppClient.Password = PassWord;
                ObjXmppClient.Server = instance.ServerIPAddress;  //user server for emulator and ip address for device.
                ObjXmppClient.AutoReconnect = true;
                ObjXmppClient.RetrieveRoster = true;
                ObjXmppClient.PresenceStatus = new PresenceStatus() { PresenceType = PresenceType.available, IsOnline = true };
                ObjXmppClient.AutoAcceptPresenceSubscribe = true;
                ObjXmppClient.AttemptReconnectOnBadPing = true;
                ObjXmppCon = new XMPPConnection(ObjXmppClient);
                ObjXmppCon.Connect();
                ObjXmppClient.Connect();
                //initializing the xmpp connection
                ObjXmppCon.OnAsyncConnectFinished +=instance.ObjXmppCon_OnAsyncConnectFinished;
                ObjXmppClient.OnStateChanged +=  new EventHandler(instance.XMPPClient_OnStateChanged);
                Thread.Sleep(2000);


            }



           public  void ObjXmppCon_OnAsyncConnectFinished(xmedianet.socketserver.SocketClient client, bool bSuccess, string strErrors)
            {


              IsXmppSuccess = client.Connected;


            }



           public   void XMPPClient_OnStateChanged(object sender, EventArgs e)//error
           {
               switch (ObjXmppClient.XMPPState)
               {
                   case XMPPState.Ready:
                       if (IsXmppSucces)//error
                       {
                           this.Dispatcher.BeginInvoke(() =>
                           {
                               //CloseOverLay();

                               //MessageBox.Show("Successfully logged in");
                               NavigationService.Navigate((new Uri("/Output.xaml?key=success", UriKind.Relative)));//error
                               //return;
                           });
                       }
                       else
                       {

                           this.Dispatcher.BeginInvoke(() =>//error
                           {
                               MessageBox.Show("Check server name/IpAddress");

                               return;
                           });
                       }
                       break;

                   case XMPPState.AuthenticationFailed: this.Dispatcher.BeginInvoke(() =>//error
                   {
                       MessageBox.Show("Enter valid username and password");

                       return;

                   }); break;
               }
           }







            private void btnLogin_Click(object sender, RoutedEventArgs e)//error
            {
                if (txtUserName.Text.Trim() == string.Empty)//error
                {
                    MessageBox.Show("Enter Username");
                    return;
                }
                if (txtPassword.Password.Trim() == string.Empty)
                {
                    MessageBox.Show("Enter Password");
                    return;
                }

                UserName = txtUserName.Text.Trim();
                PassWord = txtPassword.Password.Trim();
                IsXmppValid();
            }


        }
    }
}

2> i am getting error in these methodes:

public   void XMPPClient_OnStateChanged(object sender, EventArgs e)//error
           {
               switch (ObjXmppClient.XMPPState)
               {
                   case XMPPState.Ready:
                       if (IsXmppSucces)  // doesnot exist error
                       {
                           this.Dispatcher.BeginInvoke(() =>//<pre>Dispatcher-doesnot contain the definition error
                           {
                               //CloseOverLay();

                               //MessageBox.Show(&quot;Successfully logged in&quot;);
                               NavigationService.Navigate((new Uri(&quot;/Output.xaml?key=success&quot;, UriKind.Relative)));//error
                               //return;
                           });
                       }
                       else
                       {

                           this.Dispatcher.BeginInvoke(() =&gt;//error
                           {
                               MessageBox.Show(&quot;Check server name/IpAddress&quot;);

                               return;
                           });
                       }
                       break;

                   case XMPPState.AuthenticationFailed: this.Dispatcher.BeginInvoke(() =&gt;//error
                   {
                       MessageBox.Show(&quot;Enter valid username and password&quot;);

                       return;

                   }); break;
               }
           }




</pre>

2.
private void btnLogin_Click(object sender, RoutedEventArgs e)//error
{
if (txtUserName.Text.Trim() == string.Empty)//cannot access non static member
{
MessageBox.Show("Enter Username");
return;
}
if (txtPassword.Password.Trim() == string.Empty)
{
MessageBox.Show("Enter Password");
return;
}

UserName = txtUserName.Text.Trim();
PassWord = txtPassword.Password.Trim();
IsXmppValid();//0 arguments error
}