/ Published in: C#
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// Declair public const int WM_NCLBUTTONDOWN = 0xA1; public const int HT_CAPTION = 0x2; [DllImportAttribute("user32.dll")] public static extern int SendMessage(IntPtr hWnd,int Msg, int wParam, int lParam); [DllImportAttribute("user32.dll")] public static extern bool ReleaseCapture(); // Use private void AgentForm_MouseDown(object sender, MouseEventArgs e){ if (e.Button == MouseButtons.Left){ ReleaseCapture(); SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0); } } }