C# WPF exception on calling a method

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C#

WPF

C#4.0

Hello,
i have a LogInWindow.xaml.cs in witch i create a thread on a local method, in witch i am trying to call a method from an external class Client.connect(string1,string2); and i get the following exception:

{System.InvalidOperationException: The calling thread cannot access this object because a different thread owns it.
at System.Windows.Threading.Dispatcher.VerifyAccess()
at System.Windows.DependencyObject.GetValue(DependencyProperty dp)
at System.Windows.Controls.TextBox.get_Text()
at Poker.LogInWindow.callLogIn() in C:\Users\Gaby\Documents\Visual Studio 2010\Projects\Poker\Poker\LogInWindow.xaml.cs:line 86}

what should i do? thanks!

Regards,
Sas Gabriel


Code:

private void button1_Click(object sender, RoutedEventArgs e)
        {
            
            if (userInput.Text == "")
                MessageBox.Show("Please enter your username.");
            else
                if (passInput.Password == "")
                {
                    MessageBox.Show("Please enter your password.");
                }
                else
                {
                    button1.IsEnabled = false;
                    Thread t = new Thread(new ThreadStart(callLogIn));
                    t.Start();
                    
                }
        }


public void callLogIn()
        {
            try
            {
              Client.connect(userInput.Text, passInput.Password);//this is where i am getting the exception
            }
            catch (Exception e)
            {
                LogInWindow.btn.Dispatcher.Invoke(
                   System.Windows.Threading.DispatcherPriority.Normal,
                   new Action(
                   delegate()
                   {
                       LogInWindow.btn.IsEnabled = true;
                   }
               ));
                MessageBox.Show("Could not connect to server. Please try again later. ");
            }
        }