<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript">
function validate() {
var uploadcontrol = document.getElementById('<%=FileUpload3.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 here!");
return false;
}
}
} //End of function validate.
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td>
<b>Restrict File Upload sample</b> <br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return validate();" />
<br />
<asp:Label ID="lblOne" runat="server" ForeColor="Red"></asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
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