title: Binding 2 Dropdownlist in ASP.NET mvc c#
body: <p>This is my first dropdown list in my view.:<br>
  <img src="https://i.stack.imgur.com/VFj0w.png" alt="First dropdown list"></p>
  
  <p>And this is my controller:<br>
  <img src="https://i.stack.imgur.com/hmDtt.png" alt="My controller"></p>
  
  <p>My problem is that whenever I click the available dropdown in my first dropdown list it should populate the data available on the one that I have clicked on the second dropdown list. But It has an error it will not proceed to the next line which the JavaSerializer. How can I fix my code like it will work. I don't know where is the problem is, whether in the ajax? or in my controller?</p>