How to create following XML file in C#

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C#

XML

SOAP

XmlSerializer

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:ns2="http://gl.ws.apps.oracle.xxdof/">
   <env:header>
      <ns1:security>
         <ns1:usernametoken>
            <ns1:username>XXXX
            <ns1:password>YYYYYYY
         
      
   
   <env:body>
      <ns2:getgldetails>
         <arg0>
            <p_from_date>01-01-2018

            <p_group_id>
             <p_je_category>Payments

            <p_je_source>SOURCE
            <p_ledger_name>OU
            <p_to_date>31-12-2018

I want to create xml file in C# as same as above xml format. Body section will be extracted from DB and mapped it to respective tags. kindly help me to solve this issue

What I have tried:

I tried by using Xml serialization using below code to convert the data to XML. But the output is in different.

var serxml = new System.Xml.Serialization.XmlSerializer(GLGetrequest.arg0.GetType());
                var ms = new MemoryStream();
                serxml.Serialize(ms, GLGetrequest.arg0);
                string xml = Encoding.UTF8.GetString(ms.ToArray());
                XmlDocument Add_XMLDoc = new XmlDocument();
                XmlNode Add_XMLDoc_Node = null;
                Add_XMLDoc.LoadXml(xml);