Dim cdata As String= Clipboard.GetText(TextDataFormat.Html)
şeklinde okuma yerine
Dim str As System.IO.MemoryStream = TryCast(Clipboard.GetData("Html Format"),System.IO.MemoryStream)
If str IsNot Nothing Then
str.Seek(0, IO.SeekOrigin.Begin)
Dim sr As New System.IO.StreamReader(str, System.Text.Encoding.UTF8)
cdata = sr.ReadToEnd
sr.Close()
End If
şeklinde değiştirirseniz encoding problemini aşarız.