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Attachment Field
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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(
			   "ReportMailer@contoso.com",
			   to,
			   "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.
			message.Attachments.Add(data);
			//Send the message.
			SmtpClient client = new SmtpClient(server);
			// Add credentials if the SMTP server requires them.
			client.Credentials = (ICredentialsByHost)CredentialCache.DefaultNetworkCredentials;
			client.Send(message);
			// Display the message headers.
			string[] keys = message.Headers.AllKeys;
			Console.WriteLine("Headers");
			foreach (string s in keys)
			{
				Console.WriteLine("{0}:", s);
				Console.WriteLine("    {0}", message.Headers[s]);
			}
			data.Dispose();
		}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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