How to Pre validate Image size in fileupload

Question

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Hi,
I have a fileupload control. I want, when a user browse a image through this control of size more than 50 kb , an error message should display. How to do this?
I have one customvalidator as below...

XML

<asp:FileUpload ID="Fileupload1" runat="server"/>

<asp:CustomValidator ID="CustomValidator1"
                     runat="server"
                     ErrorMessage="not valid size"
                     Display="Dynamic"
                     ValidationGroup="I"
                     ControlToValidate="Fileupload1"
                     OnServerValidate="CustomValidator1_ServerValidate"
                     CssClass="validationCss">
</asp:CustomValidator>

C#

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        if (Fileupload1.HasFile)
        {
            if (Fileupload1.PostedFile.ContentLength &amp;gt;= 20960)
            {
                args.IsValid = false;
               // this.ModalPopupExtender1.Show();
            }
            else
            {
                args.IsValid = true;
            }
        }
    }

My validation is working, but when i click on the done button.
I want error message before I click the button.
Please help.

Posted 28-Oct-12 20:25pm

sanrai

Updated 28-Oct-12 21:54pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v3

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[no name] 29-Oct-12 4:52am

file upload image validation c# client side

https://www.google.co.in/search?q=file+upload+image+validation+c%23&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-beta#hl=en&client=firefox-beta&hs=e06&rls=org.mozilla:en-US%3Aofficial&sclient=psy-ab&q=file+upload+image+validation+c%23+client+side&oq=file+upload+image+validation+c%23+client+side&gs_l=serp.3...9995.13028.0.13392.14.13.0.0.0.0.251.1995.1j9j3.13.0...1.0...1c.1.KNiQ9qiKBrE&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=500143d3cb9800f1&bpcl=35466521&biw=1920&bih=987

2 solutions

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manoj12.shrivastava · Answer 1 · 2012-11-01T03:54:00

Solution 4

you don't need to write code for "Page_ClientValidate("groupName")"
because it's predefined when we use any validation control on the page
then the asp.net allow you to validate field value using this method....

you just call this function it will work..

I hope you understand..

because my English is poor.. :(

Posted 1-Nov-12 3:54am

manoj12.shrivastava

Comments

sanrai 2-Nov-12 1:57am

but every time its showing me alert() even my page return true or false.
How i get some good tutorial about this

manoj12.shrivastava · Answer 2 · 2012-10-30T01:28:00

Solution 3

Hey why should not you try javascript

JavaScript

<script type="text/javascript">
function OnBrowse()
{
if(Page_ClientValidate("I"))
{
///Your login here......
alert("something....");
return false;
}
return true;
}
</script>

call this javascript function to fileupload "onchange" event....

Posted 30-Oct-12 1:28am

manoj12.shrivastava

Updated 1-Nov-12 4:22am

v2

Comments

sanrai 1-Nov-12 1:12am

how to write code for Page_clientValidate("I"))