How do I post the following file to a webservice

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<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.interswi tchng.com/" xmlns:web="http://schemas.datacontract.org/2004/07/WebPAY.Core.ServiceFramework.Contract"> <soapenv:Header/> <soapenv:Body> <ser:GetTransactionData> <ser:transactionQueryRequest> <web:Hash>F6FF2E22F99D93DDDA52D71811FD92B3A71FA1968A66216E0D310DAD89</web:Hash> <web:ProductId>1</web:ProductId> <web:TransactionReference>123456789</web:TransactionReference> </ser:transactionQueryRequest> </ser:GetTransactionData> </soapenv:Body> </soapenv:Envelope>