Generic XML generator in C# using XSD file

I went through many SO questions however not found suitable for my situation.

I need to develop a XML generator based on the XSD I am having. User will pass data from UI and that data I need to add in XML tags and pass that file to som ethird party API.

I am having 20 different types of XML files which I need to create based on the users input. e.g. RPC, CSN are file type which user will pass based on that I need to generate XML.

till now I come up with factory design pattern which will serve me object based on the type user pass from UI (RPC,CSN). What I am not able to undestand is that how can I make this XML file generator generic so that whichever type of file I pass it will cater that request and generate XML for me.

Note: i am having 20 types of files and each file having different tags associated with it.

Factory Pattern I implemented till now:

public static IGenerateXML GetXMLRequestNode(string xmlNode)
{
        IGenerateXML generateXMLFactory = null;
        if (xmlNode.Equals("RPC"))
        {
            generateXMLFactory = new RPCFileManager();
        }
        if (xmlNode.Equals("CSN"))
        {
            generateXMLFactory = new CSNFileManager();
        }

        return generateXMLFactory;
}


private static Party_DSParty GetPartyTag(string partyId, string partyType)
{
        var partyDSObj = new Party_DSParty();

        partyDSObj.Party_ID = new Party_DSPartyParty_ID();

        partyDSObj.Party_ID.Party_Id = partyId;

        partyDSObj.Party_Type = partyType;

        return partyDSObj;
}

this tag I am creating from XSD file model object.

please suggest some generic way how can I generate XML file which we can reuse in most cases.