[RESOLVED] Moving borderless form - ERROR

[Tomexx]

Hi,
Found this code to move a borderless form, but gives me an error:

using Microsoft.Win32;
 
private const int WM_NCLBUTTONDOWN = 0xA1; 
private const int HTCAPTION = 0x2; 
 
[DllImport("user32.dll")] 
public static extern bool ReleaseCapture(); 
 
[ DllImport( "user32.dll" ) ] 
public static extern int SendMessage( IntPtr hWnd, int Msg, int wParam, int lParam ); 
 
private System.Windows.Forms.Button cmdExit;
private System.ComponentModel.Container components = null;
 
 
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if ( e.Button == MouseButtons.Left ) 
{ 
ReleaseCapture(); 
SendMessage( Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0 ); 
} 
}

The error says:
"The type or namespace DLLImport could not be found..."