title: How to call a web service dynamically without add service reference over SSL
body: <p>I'm developing a client that call a web service without add service reference. The method receives as a parameter an XML.</p>
  <pre><code>static void Main(string[] args)
      {
          string xmlAux = string.Empty;
          string link = &quot;https://test.xxx.com/xxx/xxx.asmx&quot;;            
          
          string arg1 = @&quot;&lt;tuca&gt; &lt;hd&gt;  &lt;t_doc&gt;10&lt;/t_doc&gt; &lt;id_user&gt;xxx&lt;/id_user&gt; &lt;pwd&gt;xxx&lt;/pwd&gt; &lt;id_pais&gt;xxx&lt;/id_pais&gt; &lt;/hd&gt; &lt;parametros&gt; &lt;par tipo=&quot;&quot;tipo_sujeto&quot;&quot;&gt;fisico&lt;/par&gt; &lt;par tipo=&quot;&quot;calificacion&quot;&quot;&gt;xxx&lt;/par&gt; &lt;par tipo=&quot;&quot;CEDULA DE IDENTIDAD&quot;&quot;&gt;xxx&lt;/par&gt; &lt;/parametros&gt; &lt;/tuca&gt;&quot;;
  
          object[] arguments = { arg1 };
          
          var ws = CallWebService(link, &quot;xxx&quot;, &quot;Reporte&quot;, arguments);
          
          if (ws != null)
          {
              xmlAux = ws.ToString();
          }
      }
       [System.Security.Permissions.SecurityPermissionAttribute(System.Security.Permissions.SecurityAction.Demand, Unrestricted = true)]
      internal static object CallWebService(string webServiceAsmxUrl, string serviceName, string methodName, object[] args)
      {
          System.Net.WebClient client = new System.Net.WebClient();
  
          // Connect To the web service
          System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + &quot;?wsdl&quot;);
  
          // Now read the WSDL file describing a service.
          var description = System.Web.Services.Description.ServiceDescription.Read(stream);
  
          ///// LOAD THE DOM /////////
          // Initialize a service description importer.
          var importer = new System.Web.Services.Description.ServiceDescriptionImporter();
  
          importer.ProtocolName = &quot;Soap12&quot;; // Use SOAP 1.2.
  
          importer.AddServiceDescription(description, null, null);
  
          // Generate a proxy client.
          importer.Style = System.Web.Services.Description.ServiceDescriptionImportStyle.Client;
  
          // Generate properties to represent primitive values.
          importer.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties;
  
          // Initialize a Code-DOM tree into which we will import the service.
          var nmspace = new System.CodeDom.CodeNamespace();
  
          var unit1 = new System.CodeDom.CodeCompileUnit();
          unit1.Namespaces.Add(nmspace);
  
          // Import the service into the Code-DOM tree. This creates proxy code that uses the service.
          var warning = importer.Import(nmspace, unit1);
  
          if (warning == 0) // If zero then we are good to go
          {
              // Generate the proxy code
              var provider1 = System.CodeDom.Compiler.CodeDomProvider.CreateProvider(&quot;CSharp&quot;);
  
              // Compile the assembly proxy with the appropriate references
              string[] assemblyReferences = new string[5] { &quot;System.dll&quot;, &quot;System.Web.Services.dll&quot;, &quot;System.Web.dll&quot;, &quot;System.Xml.dll&quot;, &quot;System.Data.dll&quot; };
  
              var parms = new System.CodeDom.Compiler.CompilerParameters(assemblyReferences);
  
              var results = provider1.CompileAssemblyFromDom(parms, unit1);
  
              // Check For Errors
              if (results.Errors.Count &gt; 0)
              {
                  foreach (System.CodeDom.Compiler.CompilerError oops in results.Errors)
                  {
                      System.Diagnostics.Debug.WriteLine(&quot;========Compiler error============&quot;);
                      System.Diagnostics.Debug.WriteLine(oops.ErrorText);
                  }
  
                  throw new System.Exception(&quot;Compile Error Occured calling webservice. Check Debug ouput window.&quot;);
  
              }
  
              // Finally, Invoke the web service method
              object wsvcClass = results.CompiledAssembly.CreateInstance(serviceName);
  
              var mi = wsvcClass.GetType().GetMethod(methodName);
  
              return mi.Invoke(wsvcClass, args);
  
          }
  
          else
          {
              return null;
          }
  
      }
  </code></pre>
  <p>In the line:</p>
  <pre><code>return mi.Invoke(wsvcClass, args) 
  </code></pre>
  <p>throws exception:</p>
  <blockquote>
  <p>InnerException: {&quot;The underlying connection was closed: An unexpected error occurred on a receive.&quot;}</p>
  <p>Message: Exception has been thrown by the target of an invocation.</p>
  </blockquote>