.

Summary

The RedrawWindow API

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:

const int RDW_INVALIDATE =0x0001;

const int RDW_INTERNALPAINT =0x0002;

const int RDW_ERASE =0x0004;

const int RDW_VALIDATE =0x0008;

const int RDW_NOINTERNALPAINT =0x0010;

const int RDW_NOERASE =0x0020;

const int RDW_NOCHILDREN =0x0040;

const int RDW_ALLCHILDREN =0x0080;

const int RDW_UPDATENOW =0x0100;

const int RDW_ERASENOW =0x0200;

const int RDW_FRAME =0x0400;

const int 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:

Do you know one? Please contribute it!

Documentation

RedrawWindow on MSDN