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    <p>Here's how I've done this:</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Threading; using System.Windows.Forms; public partial class MainForm : Form { #region Dll Imports private const int HWND_BROADCAST = 0xFFFF; private static readonly int WM_MY_MSG = RegisterWindowMessage( "WM_MY_MSG" ); [DllImport( "user32" )] private static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam); [DllImport( "user32" )] private static extern int RegisterWindowMessage(string message); #endregion Dll Imports static Mutex _single = new Mutex(true, "{4EABFF23-A35E-F0AB-3189-C81203BCAFF1}"); [STAThread] static void Main() { // See if an instance is already running... if (_single.WaitOne(TimeSpan.Zero, true)) { // No...start up normally. Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); try { Application.Run(new MainForm()); } catch (Exception ex) { // handle exception accordingly } finally { _single.ReleaseMutex(); } } else { // Yes...Bring existing instance to top and activate it. PostMessage( (IntPtr) HWND_BROADCAST, WM_MY_MSG, new IntPtr(0xCDCD), new IntPtr(0xEFEF)); } } protected override void WndProc(ref Message m) { if (m.Msg == WM_MY_MSG) { if ((m.WParam.ToInt32() == 0xCDCD) &amp;&amp; (m.LParam.ToInt32() == 0xEFEF)) { if (WindowState == FormWindowState.Minimized) { WindowState = FormWindowState.Normal; } // Bring window to front. bool temp = TopMost; TopMost = true; TopMost = temp; // Set focus to the window. Activate(); } } else { base.WndProc(ref m); } } } </code></pre> <p>I hope I've transcribed this correctly. I had to leave out a lot of other stuff, but I think I got what is necessary. What I have works for me without fail. If you have a problem, let me know, and I'll see what I've missed.</p>
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    1. COYou will need a reference to 'System.Runtime.InteropServices'
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    2. CO@BillW: Thanks. Post is updated accordingly.
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    3. CO@Matt Nice work, Matt ! fyi : builds, works fine in VS 2010 beta 2 compiled against FrameWork 4.0. What I really like about this is you can put a call to 'MessageBox.Show("..."); in the case you are re-activating the one-and-only instance to let the end-user know what's going on. My one question would be around the issue of putting the activation in a try-catch block so you can release the Mutex : does that have any implications for application behavior if the main form instance goes on to create other forms or whatever ?
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