XML : How can I make an HTTP request and send some xml data using POSTin c#

I have to make a HTTP request with URL https://{server}/apimember/services/rest/member/insertOrUpdateMember/{token}
Now I need to send the xml as data with some fields
The xml looks like

  <?xml version="1.0" encoding="utf-8"?>  <synchroMember>   <memberUID>{field1}:{value1}|{field2}:{value2}</memberUID>   <dynContent>   <entry>    <key>{fieldNameA}</key>    <value>{fieldValueA}</value>   </entry>   <entry>    <key>{fieldNameB}</key>    <value>{fieldValueB}</value>   </entry>   <entry>    <key>{fieldNameC}</key>    <value>{fieldValueC}</value>   </entry>  </dynContent>  </synchroMember>`    

I need to insert the values of field1, fieldNameA, fieldNameB, fieldNameC.
Later I can read the response of the requested URL.
Thanks.