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SmtpClient Constructor (String)

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
)

Parameters

host
Type: System.String

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 null 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;

      try {
			  client.Send(message);
			}  
			catch (Exception ex) {
			  Console.WriteLine("Exception caught in CreateTimeoutTestMessage(): {0}", 
                    ex.ToString() );			  
		  }
		}
public:
    static void CreateTimeoutTestMessage(String* server )
    {
        String* to = S"jane@contoso.com";
        String* from = S"ben@contoso.com";
        String* subject = S"Using the new SMTP client.";
        String* body  = S"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(S"Changing time out from {0} to 100.", __box(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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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