private string connectionString;
            public Service1()
            {
                connectionString =WebConfigurationManager.ConnectionStrings["Database1ConnectionString"].ConnectionString;
            }
            public Service1(string conString)
            {
                connectionString =WebConfigurationManager.ConnectionStrings[conString].ConnectionString;
            }
 public clsCustomer Paint(int p)
        {
            SqlConnection objConnection = new SqlConnection(connectionString);
            DataSet objDataSet = new DataSet();
            SqlDataAdapter dataAdapter = new SqlDataAdapter();
            SqlCommand objCommand = new SqlCommand("Select * from Paint , objConnection);
            objConnection.Open();
            dataAdapter.SelectCommand = objCommand;
            dataAdapter.Fill(objDataSet);
            objConnection.Close();
        }

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.serviceModel>
        <serviceHostingEnvironment aspNetCompatibilityEnabled="false" />
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpEndpoint" closeTimeout="00:01:00" openTimeout="00:01:00"
                    receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"
                    bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
                    useDefaultWebProxy="true">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <security mode="None">
                        <transport clientCredentialType="None" proxyCredentialType="None"
                            realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://my-site/test/Service1.svc"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpEndpoint"
                contract="IService1" name="BasicHttpEndpoint" />
        </client>
    </system.serviceModel>
</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <connectionStrings>
    <add name="Database1ConnectionString" connectionString="Data Source=***;Initial Catalog=***;User ID=***;Password=***"/>
  </connectionStrings>
  
  <system.serviceModel>
    <services>
      <service behaviorConfiguration="WBasicHttpBinding.Service1Behavior" name="Web.Service1">
        <endpoint address="http://my-site/test/Service1.svc" binding="basicHttpBinding"
        bindingConfiguration="" name="BasicHttpEndpoint" contract="Web.IService1">
        </endpoint>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="WBasicHttpBinding.Service1Behavior">
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

Service1Client cl = new Service1Client(); 
                    cl.PaintCompleted += new EventHandler<PaintCompletedEventArgs>(cl_PaintCompleted);
                    cl.PaintAsync(p);

void cl_PaintCompleted(object sender, PaintCompletedEventArgs e)
        {
		   testBlog.DataContext = e.Result;
        }
                   

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="*">
        <domain uri="http://my-site/test/"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>
  

 public string  connectionString = WebConfigurationManager.ConnectionStrings["Database1ConnectionString"].ConnectionString;

<?xml version="1.0"?>
<configuration>
  <connectionStrings>
    <add name ="Database1ConnectionString" connectionString ="Data Source=***;Initial Catalog=***;User ID=***;Password=***"/>
  </connectionStrings>
  <system.web>
    <customErrors mode="Off"/>
  </system.web>
  <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="false">
      <baseAddressPrefixFilters>
        <add prefix="http://my-site/" />
      </baseAddressPrefixFilters>
    </serviceHostingEnvironment>
    <services>
      <service name="Web.Service1" behaviorConfiguration="Web.Service1Behavior">
        <endpoint address="" binding="basicHttpBinding" contract="Web.IService1"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="Web.Service1Behavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

  if (User.Identity.IsAuthenticated)
            {
              //метод 1
            }
            else
            {
             //метод 2
            }

<?xml version="1.0"?>
<configuration>
  <system.web>
    <customErrors mode="Off"/>
  </system.web>
  <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="false">
      <baseAddressPrefixFilters>
        <add prefix="http://site.ru/"/>
      </baseAddressPrefixFilters>
    </serviceHostingEnvironment>
    <services>
      <service name="App.Web.Service1" behaviorConfiguration="App.Web.Service1Behavior">
        <endpoint address="http://site.ru/test/Service1.svc" binding="basicHttpBinding" contract="App.Web.IService1"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="App.Web.Service1Behavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>