Remove the default namespace xmlns: XSD and xmlns: xsi during XML serialization.

Use the following code:

//Create our own namespaces for the output
 XmlSerializerNamespaces ns = new XmlSerializerNamespaces ();  
//Add an empty namespace and empty value 
ns.Add ("", "");  
//Create the serializer 
XmlSerializer slz = new XmlSerializer (someType);  
//Serialize the object with our own namespaces (notice the overload) 
slz.Serialize (myXmlTextWriter, someObject, ns);

In addition, the comment also mentions removing the beginning <? XML version = "1.0" encoding = "UTF-8"?> Method:

Xmlwritersettings settings = new xmlwritersettings ();
// Remove the <? XML version = "1.0" encoding = "UTF-8"?>
Settings. omitxmldeclaration = true;
Xmlwriter writer = xmlwriter. Create ("output_file_name.xml", settings );
In addition, if encoding = "UTF-8" is not started, use:
Xmlwritersettings settings = new xmlwritersettings ();
Settings. Encoding = encoding. utf8;
Xmlwriter writer = xmlwriter. Create ("output_file_name.xml", settings );