How to check if ViewBag property is null or not exists

Question

I have a requirement to execute a script in document.ready function if viewbag property is null or not exists. Below is the code I wrote to check if viewbag property not exists.

I used recommned approached where you @ViewBag.Property!=null but when I do that I get an error saying name property does not exist in current context,

@section scripts {  @if ((bool)ViewData.ContainsKey("FormSubmitFlag") == false) {     <script type="text/javascript">         $(document).ready(function () {              var pageVisitCount = sessionStorage.getItem("personalDetailsVisitCount");             if (pageVisitCount == null) {                 $("#personal-details-form").trigger('reset');                 sessionStorage.setItem("personalDetailsVisitCount", "1");             }             else {                 var validator = $("#personal-details-form").validate();                 validator.form();                 cat.personaldetails.validate();             }         });     </script> }  } 

Thank you

Answer 1

You can check for null and execute your script.

@if (ViewBag.YourKey== null) {  //your code    } 

This will check that ViewBag.YourKey is null if you want to check it for not null you can change the if condition.