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DispositionTypeNames.Attachment Field

Specifies that the attachment is to be displayed as a file attached to the e-mail message.

Namespace:  System.Net.Mime
Assembly:  System (in System.dll)

public const string Attachment

The following code example sets the disposition type for an attachment.

		public static void CreateMessageWithAttachment4(string server, string to)
			// Specify the file to be attached and sent. 
			// This example uses a file on a UNC share. 
			string file = @"\\share3\c$\reports\data.xls";
			// Create a message and set up the recipients.
			MailMessage message = new MailMessage(
			   "Quarterly data report",
			   "See the attached spreadsheet.");

			// Create  the file attachment for this e-mail message.
			Attachment data = new Attachment("qtr3.xls", MediaTypeNames.Application.Octet);
			// Add time stamp information for the file.
			ContentDisposition disposition = data.ContentDisposition;
			disposition.CreationDate = System.IO.File.GetCreationTime(file);
			disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
			disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
			disposition.DispositionType = DispositionTypeNames.Attachment;
			// Add the file attachment to this e-mail message.
			//Send the message.
			SmtpClient client = new SmtpClient(server);
			// Add credentials if the SMTP server requires them.
			client.Credentials = (ICredentialsByHost)CredentialCache.DefaultNetworkCredentials;
			// Display the message headers. 
			string[] keys = message.Headers.AllKeys;
			foreach (string s in keys)
				Console.WriteLine("{0}:", s);
				Console.WriteLine("    {0}", message.Headers[s]);

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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