VB.Net/Network Remote/Remote Basics

Call remote object method to Get and set variable

///////////////////////////////////general.vb
// Compile: vbc /target:library  general.vb
Imports System
Public Class MyRemoteObject
    Inherits MarshalByRefObject
    Private myvalue As Integer
    Public Sub New()
        Console.WriteLine("MyRemoteObject.Constructor: New Object created")
    End Sub "New
    Public Sub New(ByVal startvalue As Integer)
        Console.WriteLine("MyRemoteObject.Constructor: .ctor called with {0}", _
            startvalue)
        myvalue = startvalue
    End Sub
    Public Sub setValue(ByVal newval As Integer)
        Console.WriteLine("MyRemoteObject.setValue(): old {0} new {1}", _
            myvalue, newval)
        myvalue = newval
    End Sub
    Public Function getValue() As Integer
        Console.WriteLine("MyRemoteObject.getValue(): current {0}", _
            myvalue)
        Return myvalue
    End Function
End Class

///////////////////////////////////test.vb
// Compile: vbc /t:exe /r:general.dll test.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Module Client
    Sub Main()
        Dim channel As New HttpChannel()
        ChannelServices.RegisterChannel(channel,false)
        RemotingConfiguration.RegisterActivatedClientType( _
            GetType(MyRemoteObject), "http://localhost:1234/MyServer")
        Console.WriteLine("Client.Main(): Creating first object")
        Dim obj1 As New MyRemoteObject()
        obj1.setValue(42)
        Console.WriteLine("Client.Main(): Creating second object")
        Dim obj2 As New MyRemoteObject()
        obj2.setValue(11)
        Console.WriteLine("Obj1.getValue(): {0}", obj1.getValue())
        Console.WriteLine("Obj2.getValue(): {0}", obj2.getValue())

    End Sub
End Module


///////////////////////////////////server.vb
// vbc /target:exe  /r:general.dll server.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Module ServerStartup
    Sub Main()
        Console.WriteLine("ServerStartup.Main(): Server started")
        Dim chnl As New HttpChannel(1234)
        ChannelServices.RegisterChannel(chnl,false)
        RemotingConfiguration.ApplicationName = "MyServer"
        RemotingConfiguration.RegisterActivatedServiceType( _
            GetType(MyRemoteObject))

        
        Console.ReadLine()
    End Sub
End Module

Validate Data remotely

///////////////////////////////////general.vb
// Compile: vbc /target:library  general.vb
Imports System
Public Interface IEmployeeManager
    Function getEmployee(ByVal id As Integer) As Employee
    Function validate(ByVal cust As Employee) As ValidationResult
End Interface

<Serializable()> _
Public Class ValidationResult
    Public Sub New(ByVal ok As Boolean, ByVal msg As String)
        Console.WriteLine("ValidationResult: Object created")
        Me.Ok = ok
        Me.ValidationMessage = msg
    End Sub "New
    Public Ok As Boolean
    Public ValidationMessage As String
End Class
<Serializable()> _
Public Class Employee
    Public FirstName As String
    Public LastName As String
    Public DateOfBirth As DateTime

    Public Sub New()
        Console.WriteLine("Employee.constructor: Object created")
    End Sub "New
    Public Function getAge() As Integer
        Dim tmp As TimeSpan = DateTime.Today.Subtract(DateOfBirth)
        Return tmp.Days \ 365 " rough estimation
    End Function
End Class

///////////////////////////////////test.vb
// Compile: vbc /t:exe /r:general.dll test.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Module Client
    Sub Main()
        Dim channel As New HttpChannel()
        ChannelServices.RegisterChannel(channel,false)
        Dim mgr As IEmployeeManager = CType(Activator.GetObject( _
            GetType(IEmployeeManager), "http://localhost:1234/EmployeeManager.soap"), _
            IEmployeeManager)
        Dim cust As New Employee()
        cust.FirstName = "James"
        cust.LastName = "Band"
        cust.DateOfBirth = New DateTime(1999, 5, 12)
        Dim res As ValidationResult = mgr.validate(cust)
        Console.WriteLine("Validation result for {0} {1}" & vbCrLf & _
            "-> {2}: {3}", cust.FirstName, cust.LastName, res.Ok.ToString(), _
            res.ValidationMessage)
    End Sub
End Module
///////////////////////////////////server.vb
// vbc /target:exe  /r:general.dll server.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Class EmployeeManager
    Inherits MarshalByRefObject
    Implements IEmployeeManager
    Public Sub New()
        Console.WriteLine("EmployeeManager: Object created")
    End Sub

    Public Function getEmployee(ByVal id As Integer) As Employee _
    Implements IEmployeeManager.getEmployee
        Dim tmp As New Employee()
        tmp.FirstName = "James"
        tmp.LastName = "Band"
        tmp.DateOfBirth = New DateTime(1989, 7, 4)
        Return tmp
    End Function

    Public Function validate(ByVal cust As Employee) As ValidationResult _
    Implements IEmployeeManager.validate
        Dim age As Integer = cust.getAge()
        Console.WriteLine("EmployeeManager.validate() for {0} aged {1}", _
            cust.FirstName, age)
        If cust.FirstName Is Nothing Or cust.FirstName.Length = 0 Then
            Return New ValidationResult(False, "Firstname missing")
        End If
        If cust.LastName Is Nothing Or cust.LastName.Length = 0 Then
            Return New ValidationResult(False, "Lastname missing")
        End If
        If age < 0 Or age > 120 Then
            Return New ValidationResult(False, "Employee must be younger than 120 years")
        End If
        Return New ValidationResult(True, "Validation succeeded")
    End Function
End Class
Module ServerStartup
    Sub Main()
        Console.WriteLine("ServerStartup.Main(): Server started")
        Dim chnl As New HttpChannel(1234)
        ChannelServices.RegisterChannel(chnl,false)
        RemotingConfiguration.RegisterWellKnownServiceType( _
            GetType(EmployeeManager), _
            "EmployeeManager.soap", _
            WellKnownObjectMode.Singleton)
        
        Console.ReadLine()
    End Sub
End Module

Your first Remote client and server

///////////////////////////////RemoteObject: general.vb
// Complie: vbc /target:library  general.vb

Public Interface IEmployeeManager
    Function getEmployee(ByVal id As Integer) As Employee
End Interface
<Serializable()> _
Public Class Employee
    Public FirstName As String
    Public LastName As String
    Public DateOfBirth As DateTime

    Public Sub New()
        Console.WriteLine("Employee.constructor: Object created")
    End Sub "New
    Public Function getAge() As Integer
        Console.WriteLine("In getAge Method")
        Return 30
    End Function
End Class

/////////////////////////////test.vb
// Complie: vbc /t:exe /r:general.dll test.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Proxies
Imports System.Runtime.Remoting.Messaging

Module Client
    Sub Main()
        Dim channel As New HttpChannel()
        ChannelServices.RegisterChannel(channel,false)
        Dim mgr As IEmployeeManager = CType(Activator.GetObject( _
            GetType(IEmployeeManager), "http://localhost:1234/EmployeeManager.soap"), _
            IEmployeeManager)
        Console.WriteLine("Client.Main(): Reference to EmployeeManager acquired")
        Dim cust As Employee = mgr.getEmployee(4711)
        Dim age As Integer = cust.getAge()
        Console.WriteLine("Client.Main(): Employee {0} {1} is {2} years old.", _
            cust.FirstName, cust.LastName, age)
        Console.ReadLine()
    End Sub
End Module

///////////////////////////server.vb
// Complie: vbc /target:exe  /r:general.dll server.vb
Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Channels
Class EmployeeManager
    Inherits MarshalByRefObject
    Implements IEmployeeManager
    Public Sub New()
        Console.WriteLine("EmployeeManager.constructor: Object created")
    End Sub
    Public Function getEmployee(ByVal id As Integer) As Employee _
    Implements IEmployeeManager.getEmployee
        Console.WriteLine("EmployeeManager.getEmployee): Called")
        Dim tmp As New Employee()
        tmp.FirstName = "James"
        tmp.LastName = "Band"
        tmp.DateOfBirth = New DateTime(1007, 7, 4)
        Console.WriteLine(("EmployeeManager.getEmployee(): Returning " & _
            "Employee-Object"))
        Return tmp
    End Function
End Class
Module ServerStartup
    Sub Main()
        Console.WriteLine("ServerStartup.Main(): Server started")
        Dim chnl As New HttpChannel(1234)
        ChannelServices.RegisterChannel(chnl,false)
        RemotingConfiguration.RegisterWellKnownServiceType( _
            GetType(EmployeeManager), _
            "EmployeeManager.soap", _
            WellKnownObjectMode.Singleton)
        
        Console.ReadLine()
    End Sub
End Module