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ContentDisposition.ModificationDate Property

Gets or sets the modification date for a file attachment.

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

public DateTime ModificationDate { get; set; }

Property Value

Type: System.DateTime
A DateTime value that indicates the file modification date; otherwise, MinValue if no date was specified.

The ModificationDate property is used to send time stamp information with a file being sent in an e-mail message. This value sets the Modification-Date parameter in the Content-Disposition header sent with the e-mail message.

The MailMessage class is used to compose an e-mail message. The Attachment class is used to attach a file to an e-mail message. To set the ModificationDate property, get the ContentDisposition for the attachment using the Attachment.ContentDisposition property.

The Content-Disposition header is described in RFC 2183 available at http://www.ietf.org.

The following code example demonstrates how to set this property.

		public static void CreateMessageWithAttachment(string server)
		{
			// Specify the file to be attached and sent. 
			// This example assumes that a file named Data.xls exists in the 
			// current working directory. 
			string file = "data.xls";
			// Create a message and set up the recipients.
			MailMessage message = new MailMessage(
			   "jane@contoso.com",
			   "ben@contoso.com",
			   "Quarterly data report.",
			   "See the attached spreadsheet.");

			// Create  the file attachment for this e-mail message.
			Attachment data = new Attachment(file, 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);
			// 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 = CredentialCache.DefaultNetworkCredentials;

      try {
			  client.Send(message);
			}
			catch (Exception ex) {
			  Console.WriteLine("Exception caught in CreateMessageWithAttachment(): {0}", 
                    ex.ToString() );			  
			}
			// Display the values in the ContentDisposition for the attachment.
			ContentDisposition cd = data.ContentDisposition;
			Console.WriteLine("Content disposition");
			Console.WriteLine(cd.ToString());
			Console.WriteLine("File {0}", cd.FileName);
			Console.WriteLine("Size {0}", cd.Size);
			Console.WriteLine("Creation {0}", cd.CreationDate);
			Console.WriteLine("Modification {0}", cd.ModificationDate);
			Console.WriteLine("Read {0}", cd.ReadDate);
			Console.WriteLine("Inline {0}", cd.Inline);
			Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
			foreach (DictionaryEntry d in cd.Parameters)
			{
				Console.WriteLine("{0} = {1}", d.Key, d.Value);
			}
			data.Dispose();
		}

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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