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<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <Header>
 <Security xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
 <UsernameToken>
  <Username>Tst@gmail.com</Username>
  <Password>Test11222</Password>
  </UsernameToken>
  </Security>
  </Header>
 <Body>
 <RetrieveRequestMsg xmlns="http://exacttarget.com/wsdl/partnerAPI">
 <RetrieveRequest>
    <ObjectType>DataExtension</ObjectType>
    <Properties>Name</Properties>
    <Properties>CustomerKey</Properties>
   </RetrieveRequest>
 </RetrieveRequestMsg>
   </Body>
  </Envelope>