Question

I am using FileUpload control to facilitate Image file upload on my website.
I want to restrict a user to upload only Image file.
I am using

 if (fupFirmLogo.PostedFile.ContentType == "image/Jpeg")
            { 

            } 

to check if the file is a image or not. I want to allow all image extensions like PNG, GiF, Jpeg, tif , BMP etc. How should I do it.

Answer 1

you should use regular expression to validate that is an image or not, might be the better option

some thing like:

 public static bool IsValidImage(this string fileName)
    {           
        Regex regex = new Regex(@"(.*?)\.(jpg|JPG|jpeg|JPEG|png|PNG|gif|GIF|bmp|BMP)$");
        return regex.IsMatch(fileName);
    }

Then you check:

if (fupFirmLogo.FileName.IsValidImage())
{
    //Do your code
}
else
 {
    //Not a valid image
  }