Getting Salesforce session ID

Put the post request on XML files

 Function GetSalesForceSessionID() As String

        Dim SID As String = String.Empty

        Dim AllowUploadSalesforce As String

        AllowUploadSalesforce = ConfigurationManager.AppSettings("allowUploadSalesforce").ToLower()

        If AllowUploadSalesforce = "true" Then

            '''' Loading XML Data
            Dim XMLDoc As New StreamReader(Me.Server.MapPath("~") + "/XMLTemplates/WestpacCredentials.xml")

            '''' Transform XML data to byte array
            Dim XMLData As String
            XMLData = XMLDoc.ReadToEnd()
            Dim PostData As Byte() = Encoding.UTF8.GetBytes(XMLData)

            '''' Post XML data to Salesforce
            Dim WClient As New WebClient
            WClient.Headers.Add("SOAPAction", "login")
            WClient.Headers.Add("Content-Type", "text/xml; charset=utf-8")

            Dim OutPutData As Byte()

            Try
                OutPutData = WClient.UploadData(ConfigurationManager.AppSettings("SFEndPoint"), "POST", PostData)

                '''' Reading the the response
                Dim XMLOutPut As String
                XMLOutPut = WClient.Encoding.GetString(OutPutData)

                '''' Transform XML string to XML document
                Dim XMLOutputDoc As New XmlDocument
                XMLOutputDoc.LoadXml(XMLOutPut)

                Dim root As XmlElement
                root = XMLOutputDoc.DocumentElement

                '''' Reading SessionID from xml
                SID = root("soapenv:Body")("loginResponse")("result")("sessionId").InnerText

            Catch ex As Exception

                SID = String.Empty
                Me.SendServiceError(ex.ToString())

            End Try

            WClient.Dispose()
        End If

        Return SID

    End Function