C# Signature:

[DllImport("user32.dll")]
static extern bool RedrawWindow(IntPtr hWnd, [In] ref RECT lprcUpdate,
   IntPtr hrgnUpdate, uint flags);

[DllImport("user32.dll")]
static extern bool RedrawWindow(IntPtr hWnd, IntPtr lprcUpdate,
                  IntPtr hrgnUpdate, uint flags);

User-Defined Types:

None.

Notes:

RedrawWindow() flags:

#define RDW_INVALIDATE 0x0001

#define RDW_INTERNALPAINT 0x0002

#define RDW_ERASE 0x0004

#define RDW_VALIDATE 0x0008

#define RDW_NOINTERNALPAINT 0x0010

#define RDW_NOERASE 0x0020

#define RDW_NOCHILDREN 0x0040

#define RDW_ALLCHILDREN 0x0080

#define RDW_UPDATENOW 0x0100

#define RDW_ERASENOW 0x0200

#define RDW_FRAME 0x0400

#define RDW_NOFRAME 0x0800

[StructLayout(LayoutKind.Sequential)]

public struct RECT{

    public int  Left;
    public int  Top;
    public int  Right;
    public int  Bottom;

}

Tips & Tricks:

Please add some!

Sample Code:

    private void InvalidateWindow()
    {
        WinAPI.RedrawWindow(this.Handle, IntPtr.Zero, IntPtr.Zero,
         0x0400/*RDW_FRAME*/ | 0x0100/*RDW_UPDATENOW*/
         | 0x0001/*RDW_INVALIDATE*/);
    }

Alternative Managed API:

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