{"There is no Unicode byte order mark. Cannot switch to Unicode."}

If you have an XML with encoding="utf-16" trying to deserialize it using MemoryStream
Encoding.ASCII it will throw this error=>{"There is no Unicode byte order mark. Cannot switch to Unicode."}



Solution:

                                                           
public static T DeserializeObject(string xml)                                 
{                                                                                
   using (TextReader reader = new StringReader(xml))                             
   {                                                                             
       XmlSerializer xs = new XmlSerializer(typeof(T));                          
       return (T)xs.Deserialize(reader);                                         
   }                                                                             
}                                                                                

Deserialize XML to object which has encoding ="utf-8"

                                                           
public static T DeserializeObject(string xml)                                 
{                                                                                
    XmlSerializer xs = new XmlSerializer(typeof(T));                             
    MemoryStream memoryStream = new MemoryStream(StringToASCIIByteArray(xml));   
    XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.ASCII);
    return (T)xs.Deserialize(memoryStream);                                      
}