Wont required field validator work for a FileUpload?

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I tried my level best to adopt a required field validator for my FileUpload. It is not working. Can anyone guide me please.

XML

--%><asp:Panel ID="Panel117" runat="server"
        style="border-width: 1px; border-style: solid; top: 400px; left: 1185px; position: absolute; height: 161px; width: 279px; background-color:InactiveBorder; border-color:Black">

            <asp:Image ID="ImagePreview" runat="server" Height="97px" Width="99px"
            style="z-index: 1"/>
            <asp:FileUpload ID="PhotoUpload" runat="server"
              style="z-index: 1; left:100px; top: 53px; position: absolute; height: 46px; width: 218px; right: 90px;" />
           <asp:Button ID="Button7" runat="server" CausesValidation="False"
            onclick="Showbutton_Click"
            style="z-index: 1; left: 7px; top: 123px; position: absolute"
            Text="Show" />

</asp:Panel>

<%--</ContentTemplate>--%>
<Triggers>
<%--<asp:AsyncPostBackTrigger ControlID="Button3" EventName="Click" />--%>
<asp:PostBackTrigger ControlID="Button2" />
</Triggers>
<%--</asp:UpdatePanel>--%>


    <asp:requiredfieldvalidator id="rfvWeeklyCommentary" runat="server" controltovalidate="PhotoUpload"
 errormessage="Select a foto."
setfocusonerror="true">
</asp:requiredfieldvalidator>

Posted 12-May-13 5:19am

S.Rajendran from Coimbatore

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Balimusi · Answer 1 · 2013-05-12T07:19:00

Input (File) is an HTML control, so you will need to run it as a server control and then validate it on the code-behind. If you don't want to set it a server control, you can validate it using JavaScript/jQuery in the client-side.
For instance,

JavaScript

var fileUpload = $("*[id$='fileUpload ']").val();
if(fileUpload == ""){
//Do your validation here
}

Murali0195 · Answer 2 · 2013-05-14T01:07:00

Hi...
see this may helpful to u.

C#

             if (!fileupload.HasFile)
            {
                lbl.Visible = true;
                lbl.ForeColor = Color.Red;
                lbl.Text = "Please Select file";    //checking if file uploader has no file selected
            }
            else
            {
                //Continue
                // if file is selected. 
            }

thank u.

Bikash Prakash Dash · Answer 3 · 2013-05-14T01:21:00

Solution 3

Required filed validator wont work
check whether it has file or not using

C#

FileUpload1.HasFile

or

C#

!(FileUpload1.PostedFile.ContentLength>0)

Posted 14-May-13 1:21am

Bikash Prakash Dash

Wont required field validator work for a FileUpload?

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