@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The ReleaseCapture API !!!!C# Signature: [DllImport("user32.dll")] static extern bool ReleaseCapture(); !!!!VB.NET Signature: <DllImport("user32.dll")> _ Private Shared Function ReleaseCapture() As Boolean End Function !!!!User-Defined Types: None. !!!!Notes: None. ReleaseCapture will delegate mousedown events to underlying controls. !!!!Tips & Tricks: Create a form without a title bar and can be moved by mouse. 'const and dll functions for moving form Public Const WM_NCLBUTTONDOWN As Integer = &HA1 Public Const HT_CAPTION As Integer = &H2 <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _ Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr End Function <DllImportAttribute("user32.dll")> _ Public Shared Function ReleaseCapture() As Boolean End Function Private Sub Form1_MouseDown(sender As Object, e As MouseEventArgs) Handles Me.MouseDown If e.Button = MouseButtons.Left Then ReleaseCapture() SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0) End If End Sub !!!!Sample Code: You can use the ReleaseCapture() function to provide drag functionality. for example the following code will allow the user to drag a control around a form (you'll have to assign this code to the mousedown event): [DllImport("User32.dll")] private static extern int SendMessage(IntPtr hWnd, int msg , int wParam , ref int lParam); [DllImport("user32")] public static extern bool ReleaseCapture(IntPtr hwnd); private const int WM_SYSCOMMAND = 0x112; private const int MOUSE_MOVE = 0xF012; private void control_MouseDown(object sender, MouseEventArgs e) { Control ctrl = sender as Control; ReleaseCapture(ctrl.Handle); int nul =0; SendMessage(ctrl.Handle, WM_SYSCOMMAND, MOUSE_MOVE, ref nul); } !!!!Alternative Managed API: Capture property on System.Windows.Forms.Control Do you know one? Please contribute it! Documentation: ReleaseCapture@msdn on MSDN
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