.

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:

C# Signature:

[DllImport("coredll.dll", SetLastError=true)]
public static extern int CreateMutex(int lpMutexAttributes, int bInitiaOwner, string lpName);
[DllImport("coredll.dll")]
public static extern int GetLastError();

User-Defined Types:

const long ERROR_ALREADY_EXISTS = 183;

Notes:

It should be used in conjunction with GetLastError() to check the application already existed in the process list.

Sample Code:

    private static bool CheckInstance()
    {        
        CreateMutex(0, 1, "<Application Name>"); // to be replaced by the name of your application
        int lastError = GetLastError();
        if (lastError == ERROR_ALREADY_EXISTS)
        {
        return true;
        }
        return false;
    }

Documentation

CreateMutex on MSDN