The following example demonstrates how to create a FileUpload control. . You can use the ContentType property to get the MIME content type of the file. tLength); int length = ; string fileName = ng(); string type = File. ContentType. = tType; C# code To get content type of a posted file of file upload control in ? 01 Wednesday.

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Try this Regular Expression Validator: Oct 14, I think the ContentType in this case is useless or has some one another idea? Fileupload control validation in javascript for particular file types. Next,in my case this approach can’t work Is there no way of looking at a file’s internal content and identify what is it’s file type? Using br As New BinaryReader fs. Can you verify that the ‘mac’ user does not have the file open while he is trying to upload?

Also using a reg expression to filter the file type in Open file dialog is somewhat unreliable since any user can type for example.

FileUpload ContentType trickery | The Forums

Thanks for clarifying the problem. Read the question carefully. Always wrap your code in pre tags. What our readers say.

In case of absence of both, you will have to check few initial bytes of file to check its type. HTMLso you just have to check that the file isn’t one that can be run online by the server. The rest are working fine but i have no idea how to validate the file types.


C# code To get content type of a posted file of file upload control in

From txt to pdf is doesn’t work and I also tested doc to pdf doesn’t worked also. Do you need your password? If it has, we use the FileUpload controls SaveAs method to save the file.

Feb 07, Jan 14, Then you can use it to check the file type. Or you should check both. So your piece of code should work. Apple user may use OpenOffice, or some other softwares to upload. We have no problems from mac, pc, linux or otherwise.

Content type is basically determined by the client, but mostly client may not send content type, in that case checking extension is only best way to verify type of file.

Stack Overflow works best with JavaScript enabled. Okay so perhaps something is wrong. I to faced the same problem. You can download the database table SQL by clicking the download link below.

FileUpload ContentType trickery Feb 26, NET translation for anyone else who might need it Community Websites Community Support. Wolf 1, 9 I would recommend you to run through some antivirus webservice or scan before acepting the files something like http: So how does the server get to know whether the file being currently uploaded is an excel file or.

File Property (trols) | Microsoft Docs

Oke I get the same results as you now What I have done in the past is to place them in a pending folder on the server, then at a given interval although it could be a called function following upload I run a small process that read the first few bytes of data. ToLower ; if FileUpload1. AddWithValue ” Data”bytes. If you ever find poostedfile site where somebody has already done this for the various file types available, please let me know!


I would use the file extension as the first line of defense,then content type, then file signature.

Can u please guide me as to how to make sure that only the text,excel or csv files are only allowed and fileulloadcontrol other file. Here is the VB. Related Links Guidance Samples Videos. Net FileUpload control, a Button and a Label. Close and your code will work. The best way to do that is using the FileOpenDialog component to let the user choose a file neatly, while adding filters to the component eg.

Fileupload image types validation C asp. Below is the part where i validate my file types: Oct 10, The cause is r. I Just tried your case with the ContentType and it will work, even if I changed the extension the contenttype will be te same. FileName ; if Finfo. This example will get the job done, but as you can see, nothing is checked.