Just a quick sketch. Validation is done as an Attribute (DataAnotations way). public class FileAttribute : ValidationAttribute { public int MaxContentLength = int.MaxValue; public string[] AllowedFileExtensions; public string[] AllowedContentTypes; public override bool IsValid(object value) { var file = value as HttpPostedFileBase; //this should be handled by [Required] if (file == null) return true; if (file.ContentLength [...]
