System.Net.Mail.AttachmentBase public abstract class AttachmentBase : IDisposable Documentation public string ContentId { get; set; } public Stream ContentStream { get; } public ContentType ContentType { get; set; } public TransferEncoding TransferEncoding { get; set; } protected AttachmentBase(Stream contentStream) protected AttachmentBase(Stream contentStream, ContentType contentType) protected AttachmentBase(Stream contentStream, string mediaType) protected AttachmentBase(string fileName) protected AttachmentBase(string fileName, ContentType contentType) protected AttachmentBase(string fileName, string mediaType) public void Dispose() protected virtual void Dispose(bool disposing)