Close application opened in .NET console application

Question

I'm opening an external application from a console application, as follows:

var p = new Process
{
    StartInfo =
    {
        FileName = "SomeApp.exe"
    }
};

p.Start();
Thread.Sleep(10000);
p.CloseMainWindow(); //Bam!! InvalidOperationExcetion

How can I close SomeApp.exe? I'm building some automation around this application and I would like it do be closed whenever I'm done with it, but I haven't been successful so far. p.CloseMainWindow() throws an exception of type InvalidOperationException with message "Cannot process request because the process (1216) has exited."

I'm not killing the process and I don't know what is killing it. I'm running this console application from Visual Studio in Administrator mode.

Any ideas? Thanks you in advance

Answer 1

When you call .WaitForExit() your current process waits until the external application is closed. There is no point in calling .Kill() afterwards, because the process is already gone. A simple example:

        var p = new Process
        {
            StartInfo =
            {
                FileName = "cmd.exe"
            }
        };

        p.Start();  

        Console.WriteLine("press any key to kill the other app");
        Console.ReadKey();
        if (!p.HasExited)
        {
            p.Kill();
            Console.WriteLine("other app was killed");
        }
        else
        {
            Console.WriteLine("other app was already dead");
        }

        Console.ReadKey();

Depending on what you want, you may as well just skip the call to .Kill() in your current code - as I've mentioned, the external process is already gone after .WaitForExit().