C# Signature:

[DllImport("user32.dll")]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X,
   int Y, int cx, int cy, uint uFlags);

VB Signature:

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, _
                      ByVal hWndInsertAfter As IntPtr, _
                      ByVal X As Integer, _
                      ByVal Y As Integer, _
                      ByVal cx As Integer, _
                      ByVal cy As Integer, _
                      ByVal uFlags As UInt32) As Boolean
End Function

VB.NET Signature:

Declare Auto Function SetWindowPos Lib "user32" (ByVal hWnd As IntPtr, _
                      ByVal hWndInsertAfter As IntPtr, _
                      ByVal X As Integer, _
                      ByVal Y As Integer, _
                      ByVal cx As Integer, _
                      ByVal cy As Integer, _
                      ByVal uFlags As UInteger) As Boolean

User-Defined Types:

C#:

static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);
static readonly IntPtr HWND_TOP = new IntPtr(0);
static readonly IntPtr HWND_BOTTOM = new IntPtr(1);

VB:

ReadOnly HWND_BOTTOM As New IntPtr(1)
ReadOnly HWND_NOTOPMOST As New IntPtr(-2)
ReadOnly HWND_TOP As New IntPtr(0)
ReadOnly HWND_TOPMOST As New IntPtr(-1)

// Values for the uFlags parameter

//From winuser.h

const UInt32 SWP_NOSIZE = 0x0001;
const UInt32 SWP_NOMOVE = 0x0002;
const UInt32 SWP_NOZORDER = 0x0004;
const UInt32 SWP_NOREDRAW = 0x0008;
const UInt32 SWP_NOACTIVATE = 0x0010;
const UInt32 SWP_FRAMECHANGED = 0x0020;  /* The frame changed: send WM_NCCALCSIZE */
const UInt32 SWP_SHOWWINDOW = 0x0040;
const UInt32 SWP_HIDEWINDOW = 0x0080;
const UInt32 SWP_NOCOPYBITS = 0x0100;
const UInt32 SWP_NOOWNERZORDER = 0x0200;  /* Don't do owner Z ordering */
const UInt32 SWP_NOSENDCHANGING = 0x0400;  /* Don't send WM_WINDOWPOSCHANGING */

VB Conversion - If you want to paste into VB.

    Shared ReadOnly SWP_NOSIZE As UInt32 = Convert.ToUInt32(&H1)
    Shared ReadOnly SWP_NOMOVE As UInt32 = Convert.ToUInt32(&H2)
    Shared ReadOnly SWP_NOZORDER As UInt32 = Convert.ToUInt32(&H4)
    Shared ReadOnly SWP_NOREDRAW As UInt32 = Convert.ToUInt32(&H8)
    Shared ReadOnly SWP_NOACTIVATE As UInt32 = Convert.ToUInt32(&H10)
    Shared ReadOnly SWP_FRAMECHANGED As UInt32 = Convert.ToUInt32(&H20)     '/* The frame changed: send WM_NCCALCSIZE */
    Shared ReadOnly SWP_SHOWWINDOW As UInt32 = Convert.ToUInt32(&H40)
    Shared ReadOnly SWP_HIDEWINDOW As UInt32 = Convert.ToUInt32(&H80)
    Shared ReadOnly SWP_NOCOPYBITS As UInt32 = Convert.ToUInt32(&H100)
    Shared ReadOnly SWP_NOOWNERZORDER As UInt32 = Convert.ToUInt32(&H200)    '/* Don't do owner Z ordering */
    Shared ReadOnly SWP_NOSENDCHANGING As UInt32 = Convert.ToUInt32(&H400)    '/* Don't send WM_WINDOWPOSCHANGING */

Notes:

HWND_TOP will bring a window to the front of the Z-Order only if the thread is in the foreground. Otherwise it will bring the window to the front of the thread's Z-order.

Tips & Tricks:

In .NET you only need to call Me.TopMost = True

Sample Code:

Please add some!

Alternative Managed API:

Do you know one? Please contribute it!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).