Hello everyone,

I'm working on an integration for my company and have a question regarding logging in and persisting the Binding object. 

My main objective is to not have to login each time a call needs to be made to the Apex API.  I'd like to have an initial login to get the session information, and then have the session info and the binding information persist.  I'm creating a class library that will house the connectors and a generic wrapper, but have run into a problem with the binding object. 

I have a class that handles and session management with a public sub called Login():

Code:

Public Sub Login()
            Try
                ' login to salesforce.com to establish a session
                _SforceLR = _binding.login(UserName, Password)

                'Reset the SOAP endpoint to the returned server URL  
                _binding.Url = _SforceLR.serverUrl
                _binding.SessionHeaderValue = New sforce.SessionHeader
                _binding.SessionHeaderValue.sessionId = _SforceLR.sessionId

                Binding = _binding

                ' write a new values for the session mgmt to the config file
                ConfigSettings.WriteSetting("SessionID", _SforceLR.sessionId)
                ConfigSettings.WriteSetting("SessionURL", _SforceLR.serverUrl)
                ConfigSettings.WriteSetting("SessionLoginTime", GetTimeStamp.timestamp.ToString)

            Catch ex As Exception
                MsgBox(ex.Message.ToString)
            End Try
        End Sub

What you see there is that the login is done and then a public property is set to hold the information.  I then have a data object class for the API calls that will use this Binding property in lieu of having to login each to to get and set the object.  so I'm thinking about something like:

Code:

 Dim ret() As sforce.sObject

            ' ret = _binding.retrieve(cField, cTable, New String() {cID})
            ret = Binding.retrieve("LastName", "Contact", New String() {"0035000000MtAPH"})

            If Not ret Is Nothing Then
                ' Return something
            Else
                ' Return Nothing
            End If

What I'm running into is an Internal 500 Server error from the API when trying to do the retrieve.  I think this is due to the public property not persisting across the classes and the property code being declared as:

 Code:

 Public Property Binding() As SforceServiceCompressed
            Get
                Return _binding
            End Get
            Set(ByVal value As SforceServiceCompressed)
                _binding = value
            End Set
        End Property

Any help at all would be great.  Since this is a .NET class library I don't have access to things like the Session and all of that, so I'm not sur how to pass the Binding object around.  For the session info I'm writing the strings out to an application config file to keep populated and updateable. 

I'm really stuck and am looking for a jump start.  It could just be that the property route is just bad, and I can live with that, but I'm not sure how to handle not having to login each time a call is made when there is a valid SFDC session already.

Thanks.
Bryan