how can we check file types before uploading them in c#

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hi all

how can we check file types before uploading them ,am using c#.
i want to upload image files. only jpeg and png files are allowed.

thanks in advance

Posted 16-Nov-11 19:11pm

Ragi Gopi

Updated 30-Oct-16 14:34pm

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3 solutions

Solution 2

refer :
http://msdn.microsoft.com/en-us/library/system.windows.forms.filedialog.filter.aspx[^]

hope this may help you.

Posted 16-Nov-11 19:37pm

member60

Solution 3

The bellow code works fine for validating file Extentions. you can check any type of file extentions.

C#

string fileName = FileUpload1.FileName;
string FileExtension = fileName.Substring(fileName.LastIndexOf('.') + 1).ToLower();
if (FileExtension == "jpeg" || FileExtension == "png")
{

    FileUpload1.SaveAs(Server.MapPath(fileName));

}

hope this will Help you.

Posted 27-Sep-13 2:33am

GopalakrishnanPS

Updated 27-Sep-13 2:40am

v2

Comments

CHill60 27-Sep-13 8:48am

Question answered 2 years ago. Adds nothing to the previous solutions and doesn't cater for files with a period in the name (e.g. file.2013.jpg is a valid name). Better to use the FileInfo class to get the extension - see http://msdn.microsoft.com/en-us/library/system.io.fileinfo.aspx[^]

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Jigar Bagadai · Accepted Answer · 2011-11-16T19:28:00

There are two way you can check the File types using C#.

1. Just Check that Extension of the File in File name if its Jpeg or png you can allow to upload but it quite tricky because some one has changed file extension and upload malicious file.

2. Second you have to check file extension and the file content.so any user change the file extension then it can not allow to upload the malicious file.
you can find that way into the following link.

and i wish you have to choose the second way which is most preferable view.

http://www.dotnetexpertguide.com/2011/05/validate-uploaded-image-content-in.html[^]