How to make a file upload control to accept or upload only file extensions like .jpeg, .bmp, .pdf.

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Hi Friends,
How to make a file upload control to accept or upload only file extensions like .jpeg, .bmp, .pdf.

Thank You In Advance.

Posted 2-Mar-11 23:27pm

Vikas U Palankar

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R. Giskard Reventlov 3-Mar-11 5:34am

What have you already tried?

3 solutions

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m@dhu · Answer 1 · 2011-03-02T23:53:00

C#

string allowedimages = System.Configuration.ConfigurationManager.AppSettings["allowedimages"];
        type = Path.GetExtension(Uploadlogo.PostedFile.FileName);
if (allowedimages.IndexOf(type) == -1)
        {
            //error message
        }
else{//continue your work
    }

In web.config file

XML

<appsettings>
<add key="AllowedImages" value=".jpeg,.JPEG,.jpe,.JPE,.jpg,.JPG,.gif,.GIF,.bmp,.BMP,.ico,.ICO"/>
</appsettings>

Albin Abel · Answer 2 · 2011-03-02T23:53:00

Hi
In the page load event you can assign a javascript to get the filename.

FileUpload1.Attributes.Add("onblur", "checkFileExtension(this);");

In the javascript you can check for the file name and if it is not the correct extension make the upload box blank. This javascript can be called on submit event and return false if the extension not match.

The javascript

C#

function checkFileExtension(uploadBox) {
    alert(uploadBox.value);
    var filePath = uploadBox.value;
    //Have your code here to check the file extension. If not match give an alert and make the upload box blank
    uploadBox.value = "";
}

Sandeep Mewara · Answer 3 · 2011-03-03T04:59:00

Solution 3

Looks like a homework assignment to a group of students. I remember answering the same yesterday.

Look here for all the replies to that question:
Same question asked and answered yesterday[^]

Posted 3-Mar-11 4:59am

Sandeep Mewara

How to make a file upload control to accept or upload only file extensions like .jpeg, .bmp, .pdf.

3 solutions

Solution 2

Solution 1

Solution 3

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