This documentation is archived and is not being maintained.

ContentDisposition.FileName Property

Gets or sets the suggested file name for an e-mail attachment.

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

public string FileName { get; set; }

Property Value

Type: System.String
A String that contains the file name.

The FileName property allows the sender to suggest the name to be used to store an e-mail attachment on the recipient's computer. This name is a suggestion only; the receiving system can ignore it. The name must not include path information; any such information is ignored by the receiving computer.

To remove file name information, you can set this property to null or the empty string ("").

The Content-Disposition header is described in RFC 2183 available at

The following code example demonstrates how to set the value of this property.

		public static void CreateMessageAttachment1(string server, string textMessage)
			// Create a message and set up the recipients.
			MailMessage message = new MailMessage(
			   "A text message for you.",
			   "Message: ");

			// Attach the message string to this e-mail message.
			Attachment data = new Attachment(textMessage, MediaTypeNames.Text.Plain);
			ContentDisposition disposition = data.ContentDisposition;
			// Suggest a file name for the attachment.
			disposition.FileName = "message" + DateTime.Now.ToString();
			//Send the message.
			SmtpClient client = new SmtpClient(server);
			client.Credentials = CredentialCache.DefaultNetworkCredentials;

	    try {
      catch (Exception ex) {
        Console.WriteLine("Exception caught in CreateMessageAttachment1(): {0}", 
                    ex.ToString() );
			// Display the values in the ContentDisposition for the attachment.
			Console.WriteLine("Content disposition");
			Console.WriteLine("File {0}", disposition.FileName);
			Console.WriteLine("Size {0}", disposition.Size);
			Console.WriteLine("Creation {0}", disposition.CreationDate);
			Console.WriteLine("Modification {0}", disposition.ModificationDate);
			Console.WriteLine("Read {0}", disposition.ReadDate);
			Console.WriteLine("Inline {0}", disposition.Inline);
			Console.WriteLine("Parameters: {0}", disposition.Parameters.Count);
			foreach (DictionaryEntry d in disposition.Parameters)
				Console.WriteLine("{0} = {1}", d.Key, d.Value);

.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.