Hi Roland,

Here is the code to determine if the same app is running.

[STAThread]
static void Main() 
{
    Process [] processes = Process.GetProcessesByName("Your program name goes 
here");

    if (processes.Length != 1)
    {
        MessageBox.Show("There is another instance of the Application, the 
current one will be closed");
        return;
    }
    else
        Application.Run(new Form1());
}

>Hi,
>
>What is the coding to determine if a compiled (Built project) is already running so that the user cannot have more than one copy running.
>
>
>Also what would the coding be to determine if a winform is already running that that the user cannot open two windows of the same form?
>
>
>Thanks
>Roland