How can i call a WCF Service

svcutil.exe http://localhost:1462/Service_Chat.svc?wsdl

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.serviceModel>
    <bindings>
      <wsDualHttpBinding>
        <binding name="WSDualHttpBinding_IService_Chat">
          <reliableSession inactivityTimeout="00:01:00" />
          <security mode="None" />
        </binding>
      </wsDualHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:1462/Service_Chat.svc" binding="wsDualHttpBinding"
          bindingConfiguration="WSDualHttpBinding_IService_Chat" contract="IService_Chat"
          name="WSDualHttpBinding_IService_Chat" />
    </client>
  </system.serviceModel>
</configuration>

'------------------------------------------------------------------------------
' <auto-generated>
'     This code was generated by a tool.
'     Runtime Version:4.0.30319.17929
'
'     Changes to this file may cause incorrect behavior and will be lost if
'     the code is regenerated.
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict Off
Option Explicit On



<System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0"), _
 System.ServiceModel.ServiceContractAttribute(ConfigurationName:="IService_Chat", CallbackContract:=GetType(IService_ChatCallback), SessionMode:=System.ServiceModel.SessionMode.Required)> _
Public Interface IService_Chat

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/Connect")> _
    Sub Connect(ByVal Username As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/SendMessage")> _
    Sub SendMessage(ByVal Username As String, ByVal message As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/OnMessage")> _
    Sub OnMessage(ByVal message As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/Disconnect")> _
    Sub Disconnect(ByVal Username As String)
End Interface

<System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")> _
Public Interface IService_ChatCallback

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/Connect")> _
    Sub Connect(ByVal Username As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/SendMessage")> _
    Sub SendMessage(ByVal Username As String, ByVal message As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/OnMessage")> _
    Sub OnMessage(ByVal message As String)

    <System.ServiceModel.OperationContractAttribute(IsOneWay:=True, Action:="http://tempuri.org/IService_Chat/Disconnect")> _
    Sub Disconnect(ByVal Username As String)
End Interface

<System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")> _
Public Interface IService_ChatChannel
    Inherits IService_Chat, System.ServiceModel.IClientChannel
End Interface

<System.Diagnostics.DebuggerStepThroughAttribute(), _
 System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")> _
Partial Public Class Service_ChatClient
    Inherits System.ServiceModel.DuplexClientBase(Of IService_Chat)
    Implements IService_Chat

    Public Sub New(ByVal callbackInstance As System.ServiceModel.InstanceContext)
        MyBase.New(callbackInstance)
    End Sub

    Public Sub New(ByVal callbackInstance As System.ServiceModel.InstanceContext, ByVal endpointConfigurationName As String)
        MyBase.New(callbackInstance, endpointConfigurationName)
    End Sub

    Public Sub New(ByVal callbackInstance As System.ServiceModel.InstanceContext, ByVal endpointConfigurationName As String, ByVal remoteAddress As String)
        MyBase.New(callbackInstance, endpointConfigurationName, remoteAddress)
    End Sub

    Public Sub New(ByVal callbackInstance As System.ServiceModel.InstanceContext, ByVal endpointConfigurationName As String, ByVal remoteAddress As System.ServiceModel.EndpointAddress)
        MyBase.New(callbackInstance, endpointConfigurationName, remoteAddress)
    End Sub

    Public Sub New(ByVal callbackInstance As System.ServiceModel.InstanceContext, ByVal binding As System.ServiceModel.Channels.Binding, ByVal remoteAddress As System.ServiceModel.EndpointAddress)
        MyBase.New(callbackInstance, binding, remoteAddress)
    End Sub

    Public Sub Connect(ByVal Username As String) Implements IService_Chat.Connect
        MyBase.Channel.Connect(Username)
    End Sub

    Public Sub SendMessage(ByVal Username As String, ByVal message As String) Implements IService_Chat.SendMessage
        MyBase.Channel.SendMessage(Username, message)
    End Sub

    Public Sub OnMessage(ByVal message As String) Implements IService_Chat.OnMessage
        MyBase.Channel.OnMessage(message)
    End Sub

    Public Sub Disconnect(ByVal Username As String) Implements IService_Chat.Disconnect
        MyBase.Channel.Disconnect(Username)
    End Sub
End Class