C# generateing xml

Question

In a C# 2008 application, I need to write code that will generate the following xml. Since
I am new to working with xml, I am wondering if you can tell me and/or
point me to a reference that will show me how to generate the following xml: 
<xs:element name="AddDocuments">
  <xs:complexType>
  <xs:annotation>
  <xs:documentation xml:lang="en">
  Request for adding Documents 
  </xs:documentation>
  </xs:annotation>
  <xs:sequence>
  <xs:element name ="PckId" type="ept:PackId"/>
  <xs:element name ="FDocs" type="ept:FDocs" minOccurs="0" maxOccurs="10"/>
  </xs:sequence>
<xs:complexType name="FDocs">
  <xs:annotation>
  <xs:documentation> Refer to the attributes doc</xs:documentation>
  </xs:annotation>
  <xs:sequence>
  <xs:element name="FDocMetadata" type="ept:FDocAttr">
  <xs:annotation>
  <xs:documentation>
  This structure.
  </xs:documentation>
  </xs:annotation>
  </xs:element>
  <xs:element name="attachmentId" type="ept:AttachmentId"/>
  </xs:sequence>
  </xs:complexType>