How do I show a console output/window in a forms application?

this one should work.

using System.Runtime.InteropServices;

private void Form1_Load(object sender, EventArgs e)
{
    AllocConsole();
}

[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AllocConsole();

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