RustyHearts-Launcher/RHLauncher.Helper/FormUtils.cs

using System.Runtime.InteropServices;

namespace RHLauncher.Helper
{
    public class FormUtils
    {
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HTCAPTION = 0x2;
        [DllImport("User32.dll")]
        private static extern bool ReleaseCapture();
        [DllImport("User32.dll")]
        private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        public static void MoveForm(IntPtr handle)
        {
            ReleaseCapture();
            SendMessage(handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
        }
    }
}