C # winform)

Using system. runtime. interopservices; // Add a mousedown event to the control. // C # drag any control with the mouse. // use the Windows API functions: sendmessage and releasecapture const uint wm_syscommand = 0x0112; const uint SC _move = 0xf010; const uint htcaption = 0x0002; [dllimport ("user32.dll", entrypoint = "sendmessagea")] Private Static extern int sendmessage (intptr hwnd, uint wmsg, uint wparam, uint lparam); [dllimport ("user32.dll")] Private Static extern int releasecapture (); void controlmousedown (Object sender, mouseeventargs e) {releasecapture (); sendmessage (sender as control ). handle, wm_syscommand, SC _move + htcaption, 0 );}