WM_SETFONT not working

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C#

PInvoke

I am trying to change the font of notepad using WM_SETFONT but its not changing.
Here is my code:

    [DllImport("user32.dll", CharSet = CharSet.Auto,SetLastError=true)]
    static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    [DllImport("gdi32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr CreateFontIndirect(ref LOGFONT lplf);

    static void Main(string[] args)
    {
      IntPtr AppHandle=Process.GetProcessesByName("notepad").First().MainWindowHandle;
      LOGFONT t = new LOGFONT();
      t.lfHeight = 30;
      t.lfCharSet = 1;
      var b = new StringBuilder("Tahoma");
      b.Append(' ',b.Capacity-6);
      t.Name =b.ToString();
      IntPtr HFont = CreateFontIndirect(ref t);
      GetError();
      SendMessage(AppHandle, 0x0030,HFont,new IntPtr(1));
      GetError();
    }

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi)]
public  struct LOGFONT
{
    public int lfHeight;
    public int lfWidth;
    public int lfEscapement;
    public int lfOrientation;
    public int lfWeight;
    public byte lfItalic;
    public byte lfUnderline;
    public byte lfStrikeOut;
    public byte lfCharSet;
    public byte lfOutPrecision;
    public byte lfClipPrecision;
    public byte lfQuality;
    public byte lfPitchAndFamily;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst =32)]
    public String Name;
}

I am running Windows XP.
GetError() is a method which just prints out the LastError Message.
I monitored the Messages received by notepad using Spy++
On executing above code ,notepad receives WM_SETFONT Message but with system font.
here is the message:WM_SETFONT hfont:650A0D90("System",10pt)fRedraw:True

Things I have tried:
-tried CreateFont() instead of CreateFontIndirect
-Marshaled byte variables in LOGFONT by U1 type
-Tried byte[],stringbuilder,string for Name Variable in LOGFONT.
-tried changing the Charset
-tried WM_ACTIVATE after WM_SETFONT message.
-tried different fonts.
I am getting a valid handle from Notepad and CreateFontIndirect.
SendMessage return 0 but the operation is successful.


Any ideas Guys?