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MailMessage.MailMessage(String, String, String, String) Constructor

Initializes a new instance of the MailMessage class.

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

public MailMessage (
	string from,
	string to,
	string subject,
	string body
public MailMessage (
	String from, 
	String to, 
	String subject, 
	String body
public function MailMessage (
	from : String, 
	to : String, 
	subject : String, 
	body : String
Not applicable.



A String that contains the address of the sender of the e-mail message.


A String that contains the address of the recipient of the e-mail message.


A String that contains the subject text.


A String that contains the message body.

Exception typeCondition


from is a null reference (Nothing in Visual Basic).


to is a null reference (Nothing in Visual Basic).


from is Empty ("").


to is Empty ("").


from or to is malformed.

The properties for the new MailMessage object are initialized as follows:





  • to

  • subject

  • body

By default, the subject and content are assumed to use the default encoding based on local computer settings. Use the BodyEncoding and SubjectEncoding properties to specify different encodings.

The following code example demonstrates calling this constructor.

public static void CreateTimeoutTestMessage(string server)
    string to = "";
    string from = "";
    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;

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