I have a SharePoint list that has an attached SP 2013 Workflow. I plan to customize the task form using Visual Studio 2012. The idea is that for each task, I will ask the user to input some values then submit (which will save the values back to my SP list). Upon submitting it will route to another user and ask for other input, and so on.
My question is how do I customize the task form using Visual Studio? Is there any server side code available, based from what I have read SharePoint 2013 Workflow is focused on client side coding.
I am having a difficult time finding the right reference materials, hopefully someone here can help to suggest some good reference materials and provide a heads-up in customizing task form.