SetWindowText does not change the property of the control

WinAPI method SetWindowText does not change the button text. Moreover, if you try to get the text through GetWindowText, it will return, exactly, the text that I tried to set, but not displayed after the fact. It's funny, but the form header changes, unlike the button, calling a method from another thread (with CheckForIlligalCross turned off) and the Invalidate buttons are not expected to work.

Upd. Code examples:

WinAPI class

[DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern int GetWindowText(HandleRef hWnd, StringBuilder lpString, int nMaxCount); [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern bool SetWindowText(IntPtr hWnd, [MarshalAs(UnmanagedType.LPTStr)] string lpString); 

Window class

 public static Window Find(IntPtr hwnd) { return new Window() { Handle = hwnd }; } public string GetText() { int capacity = WinAPI.GetWindowTextLength(new HandleRef(this, Handle)) * 2; StringBuilder stringBuilder = new StringBuilder(capacity); WinAPI.GetWindowText(new HandleRef(this, Handle), stringBuilder, stringBuilder.Capacity); return stringBuilder.ToString(); } public bool SetText(string text) { return WinAPI.SetWindowText(Handle, text); } 

Form Code:

 button1.Click += (s, e) => { var btn = Window.Find(button1.Handle); btn.SetText("hello"); MessageBox.Show(btn.GetText()); }; 

The result on the screen.