How to move a window or form without titlebar

Posted by Anuraj on Thursday, March 14, 2013

.Net Win 32 API Windows Forms

In my current project I had to implement move for a Form, which doesn’t have a title bar or FormBorderStyle property set to None. Instead of title bar I was using a Panel with background Image. Here is the code snippet.

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();

private void TitlePanel_MouseDown(object sender, MouseEventArgs e)
{
    ReleaseCapture();
    SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}

As it is WIN32 API call, you need to import System.Runtime.InteropServices namespace.


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