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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)

public SmtpClient(
	string host,
	int port
)

Parameters

host
Type: System.String

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

port
Type: System.Int32

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

ExceptionCondition
ArgumentOutOfRangeException

port cannot be less than zero.

The host and port parameters set the value of the Host and Port properties, respectively. If host is null 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.

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

      try {
			  client.Send(message);
      }
			catch (Exception ex) {
			  Console.WriteLine("Exception caught in CreateTestMessage1(): {0}", 
                    ex.ToString() );
      }              
		}

.NET Framework

Supported in: 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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