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Custom validaton to put file size limit in file upload control in asp.net

Use custom validator as follow :-

  <asp:CustomValidator ID="NewPasswordCustomValidator" runat="server" Text="File Size Limit exceed !! Only 20 MB is allowed"
                                                ToolTip="FileSize should not exceed 4 MB" ControlToValidate="FileUpload1" ClientValidationFunction="setUplaodButtonState"
                                                Display="Dynamic" ValidationGroup="submit" ErrorMessage="File Size Limit exceed !! Only 20 MB is allowed"></asp:CustomValidator>


Then make one javascript function to put limit on size upto 20mb

   function setUplaodButtonState(oSrc, args) {

            var maxFileSize = 20480000 // 20MB -> 20000 * 1024 //
            var fileUplaod = $("#<%=FileUpload1.ClientID %>");

            if (fileUplaod.val() == '') {
                args.IsValid = false;
            }
            else {
                if (fileUplaod[0].files[0].size < maxFileSize) {
                    args.IsValid = true;
                } else {
                    alert('File Size is' + ((fileUplaod[0].files[0].size / 1000) / 1024).toFixed(2) + 'MB !! Only size upto 20 MB is allowed');
                    args.IsValid = false;
                }
            }
        }


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