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Summary

On mobile devices running Windows mobile 5.0, if you need to prevent another instance of your application to load the CreateMutex function can be of good use:

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public static extern int CreateMutex(IntPtr lpMutexAttributes, bool bInitiaOwner, string lpName);

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        CreateMutex(IntPtr.Zero, true, "<Application Name>"); // to be replaced by the name of your application

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Documentation

[CreateMutex] on MSDN

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Summary

The CreateMutex API

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static extern IntPtr CreateMutex(IntPtr lpMutexAttributes, bool bInitialOwner,

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    Public Function CreateMutex(ByVal lpMutexAttributes As IntPtr, _

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Here's how I use CreateMutex() to prevent more than one instance of my application from running at any given time.

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        public static extern IntPtr CreateMutex( IntPtr lpMutexAttributes,

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        /// This value can be returned by CreateMutex() and is found in

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            // create IntPtrs for use with CreateMutex()

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                ipHMutex = Win32Calls.CreateMutex( ipMutexAttr,

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                {    // CreateMutex() failed.

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        /// This value can be returned by CreateMutex() and is found in

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        public static extern IntPtr CreateMutex(IntPtr lpMutexAttributes, bool bInitialOwner, string lpName);

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            mutex.Handle = InternalCreateMutex( initiallyOwned, name, out createdNew );

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        private static IntPtr InternalCreateMutex( bool initiallyOwned, string name, out bool createdNew )

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                    hMutex = Native.CreateMutex( mutexAttributesPtr, initiallyOwned ? true : false, name );

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Documentation

[CreateMutex] on MSDN