Hi Tim,

Thanks for your post.

Yes, after doing some more research in this issue, I found that it seems
that it is Winform's problem. Because I created a Win32 appliction, which
use Win32 Api to get the clipboard CF_HTML format, I can get it without
garbled text. Then I converted this Win32 code into managed code with
P/invoke:

[DllImport("user32.dll",SetLastError=true)]
static extern IntPtr GetClipboardData(uint uFormat);
[DllImport("user32.dll",SetLastError=true)]
static extern bool OpenClipboard(IntPtr hWndNewOwner);
[DllImport("user32.dll",SetLastError=true)]
static extern bool CloseClipboard();
[DllImport("user32.dll", SetLastError=true)]
static extern uint RegisterClipboardFormatA(string lpszFormat);
[DllImport("user32.dll",SetLastError=true)]
static extern bool IsClipboardFormatAvailable(uint format);
[DllImport("kernel32.dll",SetLastError=true)]
static extern IntPtr GlobalLock(IntPtr hMem);
[DllImport("kernel32.dll",SetLastError=true)]
static extern uint GlobalSize(IntPtr hMem);
[DllImport("kernel32.dll",SetLastError=true)]
static extern IntPtr GlobalUnlock(IntPtr hMem);

private void button1_Click(object sender, System.EventArgs e)
{
    uint CF_HTML = RegisterClipboardFormatA("HTML Format");
   
    if (IsClipboardFormatAvailable(CF_HTML))
    {
        if(OpenClipboard(this.Handle))
        {
            IntPtr hGMem = GetClipboardData(CF_HTML) ;
            IntPtr pMFP = GlobalLock(hGMem) ;
            uint len=GlobalSize(hGMem);
            byte[] bytes=new byte[len];
            Marshal.Copy(pMFP,bytes, 0, (int)len);

            string strMFP =System.Text.Encoding.UTF8.GetString(bytes);
            this.textBox1.Text=strMFP;
            GlobalUnlock(hGMem) ;
            CloseClipboard() ;
        }
    }
}

This works well on my side. Hope this helps.
=================================================================
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support