C # code like QQ in the lower right corner of the message box, regardless of the current user's focus in which window, the message box pop-up does not affect the change in focus, then there are two ways

You QQ in the lower right corner of the message box, regardless of the current user's focus in which window, message box pop-up does not affect the change in focus, then there are two ways:

Either rewrite the event that needs to pop up the form:

protected override CreateParams CreateParams {get {const int ws_ex_noactivate = 0x08000000; CreateParams CP = base.        CreateParams; Cp.        ExStyle |= ws_ex_noactivate;    return CP; }}//CreateParams under the System.Windows.Forms.Controls namespace

Either call the system hook:

Reference system hooks [DllImport ("User32.dll")]public static extern IntPtr GetActiveWindow ();  [DllImport ("User32.dll")] public static extern IntPtr SetActiveWindow (INTPTR hwnd); Do the following processing when the window pops up IntPtr activeForm = GetActiveWindow (); Get the current active form new Form2 first. Show (FALSE); Pop-up new form SetActiveWindow (ActiveForm); Before returning the focus to the active form

C # code like QQ in the lower right corner of the message box, regardless of the current user's focus in which window, the message box pop-up does not affect the change in focus, then there are two ways