Stream stream = streamInfo.Stream;
                MemoryStream ms = new MemoryStream();

                stream.CopyTo(ms);
                ms.ToArray();

                byte[] streamArray = ms.ToArray();
                //byte[] streamArray = new byte[100];

                ServiceReference1.Service1Client proxy = new ServiceReference1.Service1Client();

                proxy.TestHelloWorldCompleted += new EventHandler<ServiceReference1.TestHelloWorldCompletedEventArgs>(proxy_TestHelloWorldCompleted);
                ByteArray array = new ByteArray();
                array.Array = streamArray;
                proxy.TestHelloWorldAsync(array);

...


        void proxy_TestHelloWorldCompleted(object sender, ServiceReference1.TestHelloWorldCompletedEventArgs e)
        {

        }

        public string TestHelloWorld(ByteArray array)
        {
            MemoryStream ms = new MemoryStream();
            ms.Write(array.Array, 0, array.Array.Length);
            Stream stream = ms;
            
            Workbook workbook = this.Excel_Load(stream);
            ObservableCollection<cOrder> orders = this.getOrdersFromExcell(workbook);
            Sql.OrderListAdd(orders.ToList(), -1, -1);

            return "Hello, world!";
        }

.....

    [DataContract]
    public class ByteArray
    {
        [DataMember]
        public byte[] Array { get; set; }
    }

<binding name="LargeBinding">
          <binaryMessageEncoding
            maxReadPoolSize="2147483647"
            maxSessionSize="2147483647"
            maxWritePoolSize="2147483647">
            <readerQuotas
              maxArrayLength="2147483647"
              maxDepth="2147483647"
              maxBytesPerRead="2147483647"
              maxNameTableCharCount="2147483647"
              maxStringContentLength="2147483647" />
          </binaryMessageEncoding>
          <httpTransport
            maxBufferSize="2147483647"
            maxReceivedMessageSize="2147483647"
            maxBufferPoolSize="2147483647"/>
        </binding>

<?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
      <httpRuntime maxRequestLength="2147483647" />
    </system.web>

    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpBinding_IService1"
                    allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
                    useDefaultWebProxy="true">
                    <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
                        maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
                    <security mode="None">
                        <transport clientCredentialType="None" proxyCredentialType="None"
                            realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>   
            </basicHttpBinding>
        </bindings>
      
      <client>
        <endpoint address="http://localhost:3203/Service1.svc"  binding="basicHttpBinding"
            bindingConfiguration="BasicHttpBinding_IService1" contract="ServiceReference1.IService1"
            name="BasicHttpBinding_IService1" />
      </client>
      
    </system.serviceModel>
</configuration>

<configuration>
    <system.serviceModel>


      <bindings>
            <basicHttpBinding>
               <binding name="BasicHttpBinding_IService1" maxBufferSize="2147483647"
                    maxReceivedMessageSize="2147483647" >
                    <security mode="None" />
                </binding>

            </basicHttpBinding>
        </bindings>
        <client>
          
                      <endpoint address="http://localhost:3203/Service1.svc" binding="basicHttpBinding"
                bindingConfiguration="BasicHttpBinding_IService1" contract="ServiceReference1.IService1"
                name="BasicHttpBinding_IService1" />


        </client>
    </system.serviceModel>
</configuration>