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SmtpClient.SmtpClient(String) Constructor

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

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

public SmtpClient (
	string host
)
public SmtpClient (
	String host
)
public function SmtpClient (
	host : String
)
Not applicable.

Parameters

host

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

The host parameter is used to initialize the value of the Host property. The Credentials and Port properties are initialized by using the settings in the application or machine configuration files. If host is a null reference (Nothing in Visual Basic) or equal to String.Empty, Host 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 CreateTimeoutTestMessage(string server)
{
    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);
    Console.WriteLine("Changing time out from {0} to 100.", client.Timeout);
    client.Timeout = 100;
    // 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;
    client.Send(message);
}

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0
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