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SmtpClient.Host Property

Gets or sets the name or IP address of the host used for SMTP transactions.

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

public string Host { get; set; }
/** @property */
public String get_Host ()

/** @property */
public void set_Host (String value)

public function get Host () : String

public function set Host (value : String)

Not applicable.

Property Value

A String that contains the name or IP address of the computer to use for SMTP transactions.

Exception typeCondition

ArgumentNullException

The value specified for a set operation is a null reference (Nothing in Visual Basic).

ArgumentException

The value specified for a set operation is equal to String.Empty ("").

InvalidOperationException

You cannot change the value of this property when an email is being sent.

The value of the Host property can also be set using constructors or the application or machine configuration file. For more information, see mailSettings Element (Network Settings).

If information is specified using this property, this information overrides the configuration file settings.

The following code example demonstrates sending an e-mail message by using the host and port specified in an application configuration file.

public static void CreateTestMessage4(string server)
{
    MailAddress from = new MailAddress("ben@contoso.com");
    MailAddress to = new MailAddress("Jane@contoso.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "Using the SmtpClient class.";
    message.Body = @"Using this feature, you can send an e-mail message from an application very easily.";
    SmtpClient client = new SmtpClient(server);
    Console.WriteLine("Sending an e-mail message to {0} by using SMTP host {1} port {2}.",
         to.ToString(), client.Host, client.Port);
    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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