WPF

public class MyApp : Application
{
  private static bool newMutex;
  public static void Main()
  {
    using (Mutex m = new Mutex(true, "myApplication", out newMutex))
    {
      if (!mutexIsNew)
        // Shut it down
    }
  }
}

public partial class App : Application
{
    private static bool mutexIsNew;

    public App() : base()
    {
        using (Mutex m = new Mutex(true, "MyApp", out mutexIsNew))
        {
            if (mutexIsNew)
            {
                AppMainWindow mainwindow = new AppMainWindow();
                mainwindow.Show();
            }
            else
            {
                App.Current.Shutdown();
            }
        }
    }
}

Jammer

Going where everyone here has gone before!
My Blog

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Threading;

namespace SingleInstanceApp
{
  public class SIApplication : Application
  {
    private static bool isNew;
    [STAThread]
    public static void Main()
    {
      using (Mutex m = new Mutex(true, "SIApplication.Mutex", out isNew))
      {
        if (isNew)
        {
          SIApplication app = new SIApplication();
          app.InitializeComponent();
          app.Run();
        }
      }
    }

    public void InitializeComponent()
    {
      this.StartupUri = new Uri("Window1.xaml", System.UriKind.Relative);
    }
  }
}

<br />
public partial class App : Application<br />
{<br />
    protected override void OnStartup(StartupEventArgs e)<br />
    {<br />
        bool mutexCreated;<br />
        mutexRunOnce = new System.Threading.Mutex(<br />
            true, "{someGUID}", out mutexCreated);<br />
        if (!mutexCreated)<br />
        {<br />
            return;<br />
        }<br />
<br />
        base.OnStartup(e);<br />
    }<br />
    //...<br />
}<br />

R A Roldan wrote:

Josh, you're the man

using (StreamReader reader = new StreamReader("myControl.xaml"))
{
  DependencyObject root = XamlReader.Load(reader.BaseStream) as DependencyObject;
  if (root != null)
  {
    ContentControl cont = FindName("display") as ContentControl;
    cont.Content = root;
  }
}

<Window... usual Xaml declarations ..>
  <Grid x:Name="myGrid">
    <Grid.RowDefinitions>
      <RowDefinition />
    </Grid.RowDefinitions>
    <Grid.ColDefinitions>
      <ColDefinition />
      <ColDefinition />
    </Grid.ColDefinitions>
    <Frame Grid.Row="0" Grid.Column="1" x:Name="display" />
  </Grid>
</Window>

katelva wrote:

It means created the silverlight application which hosts in asp.net,am I right?

katelva wrote:

Actually, I would like to do is create Asp.net website(navigation), then when I click on the link it will appear the Login form in the asp.net webform which mean the design is using css and asp.net but the content such as registration form, login form...etc is using silverlight.