DESKTOP_CREATEWINDOW = 0x00000002,

    DESKTOP_CREATEWINDOW = &H2

    /// The WM_CREATE message is sent when an application requests that a window be created by calling the CreateWindowEx or CreateWindow function. (The message is sent before the function returns.) The window procedure of the new window receives this message after the window is created, but before the window becomes visible.

    /// The WM_PARENTNOTIFY message is sent to the parent of a child window when the child window is created or destroyed, or when the user clicks a mouse button while the cursor is over the child window. When the child window is being created, the system sends WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the window returns. When the child window is being destroyed, the system sends the message before any processing to destroy the window takes place.

    '''The WM_CREATE message is sent when an application requests that a window be created by calling the CreateWindowEx or CreateWindow function. (The message is sent before the function returns.) The window procedure of the new window receives this message after the window is created but before the window becomes visible.

    '''The WM_PARENTNOTIFY message is sent to the parent of a child window when the child window is created or destroyed or when the user clicks a mouse button while the cursor is over the child window. When the child window is being created the system sends WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the window returns. When the child window is being destroyed the system sends the message before any processing to destroy the window takes place.

    ''' calling the <c>CreateWindowEx</c> or <c>CreateWindow</c> function.

    DESKTOP_CREATEWINDOW    = 0x0002,

    GENERIC_ALL         = ( DESKTOP_READOBJECTS | DESKTOP_CREATEWINDOW | DESKTOP_CREATEMENU |

[DllImport("user32.dll", EntryPoint="CreateWindowStation", CharSet=CharSet.Unicode, SetLastError=true)]

    public static extern IntPtr CreateWindowStation(

public static SafeWindowStationHandle CreateWindowStation(string name)

        IntPtr handle = WindowStationAndDesktop.CreateWindowStation(name, 0,

/// The CreateWindowEx function creates an overlapped, pop-up, or child window with an extended window style; otherwise, this function is identical to the CreateWindow function.

/// <param name="lpWindowName">Pointer to a null-terminated string that specifies the window name. If the window style specifies a title bar, the window title pointed to by lpWindowName is displayed in the title bar. When using CreateWindow to create controls, such as buttons, check boxes, and static controls, use lpWindowName to specify the text of the control. When creating a static control with the SS_ICON style, use lpWindowName to specify the icon name or identifier. To specify an identifier, use the syntax "#num". </param>

/// <para>If an application calls CreateWindow to create a MDI client window, lpParam should point to a CLIENTCREATESTRUCT structure. If an MDI client window calls CreateWindow to create an MDI child window, lpParam should point to a MDICREATESTRUCT structure. lpParam may be NULL if no additional data is needed.</para></param>

public static extern IntPtr CreateWindowEx(

''' The CreateWindowEx function creates an overlapped, pop-up, or child window with an extended window style; otherwise, this function is identical to the CreateWindow function.

''' <param name="lpWindowName">Pointer to a null-terminated string that specifies the window name. If the window style specifies a title bar, the window title pointed to by lpWindowName is displayed in the title bar. When using CreateWindow to create controls, such as buttons, check boxes, and static controls, use lpWindowName to specify the text of the control. When creating a static control with the SS_ICON style, use lpWindowName to specify the icon name or identifier. To specify an identifier, use the syntax "#num". </param>

''' <para>If an application calls CreateWindow to create a MDI client window, lpParam should point to a CLIENTCREATESTRUCT structure. If an MDI client window calls CreateWindow to create an MDI child window, lpParam should point to a MDICREATESTRUCT structure. lpParam may be NULL if no additional data is needed.</para></param>

Public Shared Function CreateWindowEx( _

When you call this function, the WndProc function must respond to the WM_NCCREATE message by returning TRUE. If it does not, the creation process will fail. A null handle will be returned from CreateWindowEx and GetLastError will return 0. See MSDN on WM_NCCREATE (http://msdn.microsoft.com/en-us/library/ms632635.aspx) and also WM_CREATE (http://msdn.microsoft.com/en-us/library/ms632619.aspx). You can have your WndProc call DefWindowProc, which will take care of this issue.

This is a sample HelloWin ported from Petzolds book (chapter 3) to illustrate the IntPtr issue for classname on CreateWindow

            IntPtr hwnd = Win32.CreateWindowEx(

The [System.Windows.Forms.NativeWindow] class can be used to encapsulate a window handle. It provides properties and methods that can be used to perform the same behavior as the CreateWindowEx method.