An exception of type 'System.IO.FileNotFoundException'

Question

Here i am trying to develop a chat app using xmpp and openfire server in windows phone 8.1.when i am trying to connect with openfire server it showing this error.i tried out many ways but no result and i cannot understand too..(i added username and password in server)

 

this part am getting error.. -ObjXmppClient = new XMPPClient();

 

An exception of type 'System.IO.FileNotFoundException' occurred in xmppStart.exe but was not handled in user code

Additional information: Could not load file or assembly 'System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies. The system cannot find the file specified.

 

 

 

MY CODE:

 

my code is given below [If it is not the way to connect server using xmpp pls let me know]

<pre>using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Runtime.InteropServices.WindowsRuntime;

using Windows.Foundation;

using Windows.Foundation.Collections;

using Windows.UI.Xaml;

using Windows.UI.Xaml.Controls;

using Windows.UI.Xaml.Controls.Primitives;

using Windows.UI.Xaml.Data;

using Windows.UI.Xaml.Input;

using Windows.UI.Xaml.Media;

using Windows.UI.Xaml.Navigation;

using System.Net.XMPP;

using System.Threading;

using Windows.UI.Popups;

namespace xmppStart

{

public sealed partial class MainPage : Page

{

public XMPPClient ObjXmppClient { get; set; }

public XMPPConnection ObjXmppCon { get; set; }

public string username = "sree";

public string password = "sree";

public readonly string server = "taurus";

private Boolean IsXmppSuccess { get; set; }

public MainPage()

{

this.InitializeComponent();

this.NavigationCacheMode = NavigationCacheMode.Required;

}

private void IsXmppValid()

{

//initializing the xmpp client with credentials

ObjXmppClient = new XMPPClient();

ObjXmppClient.JID = username + "@" + server;

ObjXmppClient.Password = password;

ObjXmppClient.Server = server; //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 += ObjXmppCon_OnAsyncConnectFinished;

ObjXmppClient.OnStateChanged += new EventHandler(xMPPClient_OnStateChanged);

}

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

{

IsXmppSuccess = client.Connected;

}

public async void xMPPClient_OnStateChanged(object sender, EventArgs e)

{

switch (ObjXmppClient.XMPPState)

{

case XMPPState.Ready:

if (IsXmppSuccess)

{

await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =&gt;

{

Frame.Navigate(typeof(Logedin));

});

}

else

{

await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =&gt;

{

MessageDialog msgbox = new MessageDialog("Check server name/IpAddress");

});

}

break;

case XMPPState.AuthenticationFailed: await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =&gt;

{

MessageDialog msgbox = new MessageDialog("Enter valid username and password");

return;

}); break;

}

}

protected override void OnNavigatedTo(NavigationEventArgs e)

{

}

private void Button_Click(object sender, RoutedEventArgs e)

{

if (txtname.Text == string.Empty)

{

MessageDialog msgbox = new MessageDialog("enter user name");

return;

}

if (txtpassword.Text == string.Empty)

{

MessageDialog msgbox = new MessageDialog("enter password");

return;

}

username = txtname.Text;

password = txtpassword.Text;

IsXmppValid();

}

}