Validating Fileupload Control

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Hi
I want to validate file-upload control to allow only word document.
How can i achieve this?can any one tell.

I am using regular expression

HTML

^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.txt)$

but it will accept other files also.

can any one tell me?

Posted 18-Nov-11 23:34pm

Thendral.N

Updated 20-Nov-11 20:45pm

member60

v2

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srinivas vadepally 19-Nov-11 7:08am

Hi Thendral,
Better go with code behind.
or go through url
http://stackoverflow.com/questions/71944/how-do-i-validate-the-file-type-of-a-file-upload

srinivas vadepally 19-Nov-11 7:10am

Have you provide the control to validate property?
Just verify it.

2 solutions

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Sunasara Imdadhusen · Answer 1 · 2011-11-20T18:31:00

Hi,

You can't validate file on File Open Dialog in Asp.Net but you can validate file after selecting file from dialog.
Following are code to verify uploaded file is valid or not.

Javscript

JavaScript

<script type="text/javascript" language="javascript">
function validate() {
  var uploadcontrol = document.getElementById('<%=FileUpload1.ClientID%>').value;
  //Regular Expression for fileupload control.
  var reg = /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.DOC|.DOCX)$/;
  if (uploadcontrol.length > 0)
  {
    //Checks with the control value.
    if (reg.test(uploadcontrol))
    {
       return true;
    }
    else
    {
       //If the condition not satisfied shows error message.
       alert("Only .doc, docx files are allowed!");
       return false;
    }
  }
} //End of function validate.
</script>

HTML

XML

<asp:fileupload id="FileUpload1" runat="server" xmlns:asp="#unknown" />
<asp:button id="Button1" runat="server" text="Button" onclientclick="return validate();" xmlns:asp="#unknown" />

VB

Thanks,
Imdadhusen

Anuja Pawar Indore · Answer 2 · 2011-11-20T20:44:00

Solution 2

Try this code behind

C#

string strextention = FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf('.'));
           if (strextention.ToLower() != ".doc")
            {
              //apply your logic here when not a doc file
            }

Posted 20-Nov-11 20:44pm

Anuja Pawar Indore

Comments

Sunasara Imdadhusen 21-Nov-11 5:02am

But this will make overload to server because it will execute on server side. so it would be better if you can prevent from client side.