[DllImport("kernel32.dll")]
static extern IntPtr GetConsoleWindow();
[DllImport("user32.dll")]
static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
const int SW_HIDE = 0;
const int SW_SHOW = 5;
// Usage:
var handle = GetConsoleWindow();
// Hide
ShowWindow(handle, SW_HIDE);
// Show
ShowWindow(handle, SW_SHOW);