ASP.NET, C#, IIS, MIME TYPES, FILE UPLOAD CONDITIONAL

Question

I have a file upload web-form on the website and it needs to only accept certain formats (or MIME types)...

The following code is working PERFECTLY, EXCEPT, it does not upload .DOCX files to the server ! That is the only file type that does not work... I have double checked every line of code and have even gotten into the IIS manager to ensure .DOCX MIME types were inherited, and they were...

Does anyone have any idea why .DOCX files will not upload to the server like every other filetype does?

Snippet of code:

string savePath = "D:\\HIDDEN PATH HERE";
string fileMsg;

// Before attempting to perform operations
// on the file, verify that the FileUpload 
// control contains a file.
if (FileUpload1.HasFile)
{
    // Check to see that the content type is proper and allowed.
    // DOC: application/doc, appl/text, application/vnd.msword, application/vnd.ms-word, application/winword, application/word, application/x-msw6, application/x-msword
    if (
        FileUpload1.PostedFile.ContentType == "text/rtf" ||
        FileUpload1.PostedFile.ContentType == "application/doc" ||
        FileUpload1.PostedFile.ContentType == "appl/text" ||
        FileUpload1.PostedFile.ContentType == "application/vnd.msword" ||
        FileUpload1.PostedFile.ContentType == "application/vnd.ms-word" ||
        FileUpload1.PostedFile.ContentType == "application/winword" ||
        FileUpload1.PostedFile.ContentType == "application/word" ||
        FileUpload1.PostedFile.ContentType == "application/msword" ||       
        FileUpload1.PostedFile.ContentType == "application/x-msw6" ||
        FileUpload1.PostedFile.ContentType == "application/x-msword" ||
        FileUpload1.PostedFile.ContentType == "application/pdf" ||
                        FileUpload1.PostedFile.ContentType == "application/x-pdf" ||
        FileUpload1.PostedFile.ContentType == "application/vnd.openxmlformats-officedocument.wordprocessingml.document" ||
        FileUpload1.PostedFile.ContentType == "application/vnd.openxmlformats-officedocument.wordprocessingml.template"
        )
    {
        // Get the name of the file to upload.
        String fileName = FileUpload1.FileName;

        // Append the name of the file to upload to the path.
        savePath += strnow + fileName;


        // Call the SaveAs method to save the 
        // uploaded file to the specified path.
        // This example does not perform all
        // the necessary error checking.               
        // If a file with the same name
        // already exists in the specified path,  
        // the uploaded file overwrites it.
        FileUpload1.SaveAs(savePath);

        // Notify the user of the name of the file
        // was saved under.
        //fileMsg = "Your file was saved as " + fileName;
        fileMsg = "";
    }
    else
    {
        fileMsg = "Your file was not an accepted format. Please use PDF, RTF or DOC formats."; 
    }

Answer 1

See this answer, which points you to this page.

DOCX Mime Type:

application/vnd.openxmlformats-officedocument.wordprocessingml.document

EDIT: Sorry, didn't see it in the list. If you want to allow DOCX, why not just check for ".docx" as the extension.

|| FileUpload1.PostedFile.FileName.ToLower().Substring(FileUpload1.PostedFile.FileName.Length - 4) == "docx"

Answer 2

You should be reading the extension, not checking mime types. MIME types are set by the browser and could be different between computers. This is not their purpose.

Also, regardless of what background you come from, if you have an if statement like that, you should feel at least the slightest bit of shame.

string[] acceptedExtensions = new string[] { ".docx", ".doc", ".txt", ".etc" };
// snip


if(acceptedExtensions.Contains(Path.GetExtension(FileUpload1.PostedFile.Filename))) 
{ 
    AcceptFile(FileUpload1.PostedFile);
}