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SmtpClient Constructor (String, Int32)

Initializes a new instance of the SmtpClient class that sends e-mail by using the specified SMTP server and port.

Namespace:  System.Net.Mail
Assembly:  System (in System.dll)

	String^ host, 
	int port


Type: System::String

A String that contains the name or IP address of the host used for SMTP transactions.

Type: System::Int32

An Int32 greater than zero that contains the port to be used on host.


port cannot be less than zero.

The host and port parameters set the value of the Host and Port properties, respectively. If host is nullptr or equal to String::Empty, Host is initialized using the settings in the application or machine configuration files. If port is zero, Port is initialized using the settings in the application or machine configuration files. The Credentials property is initialized using the settings in the application or machine configuration files.

For more information about using the application and machine configuration files, see <mailSettings> Element (Network Settings). If information is specified using SmtpClient constructors or properties, this information overrides the configuration file settings.

The following code example demonstrates calling this constructor.

   static void CreateTestMessage1( String^ server, int port )
      String^ to = L"jane@contoso.com";
      String^ from = L"ben@contoso.com";
      String^ subject = L"Using the new SMTP client.";
      String^ body = L"Using this new feature, you can send an e-mail message from an application very easily.";
      MailMessage^ message = gcnew MailMessage( from,to,subject,body );
      SmtpClient^ client = gcnew SmtpClient( server,port );

      // Credentials are necessary if the server requires the client  
      // to authenticate before it will send e-mail on the client's behalf.
      client->Credentials = CredentialCache::DefaultNetworkCredentials;

      //Display the properties on the service point.
      ServicePoint^ p = client->ServicePoint;
      Console::WriteLine( L"Connection lease timeout: {0}", p->ConnectionLeaseTimeout );
      client->Send( message );

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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