Jan 12, 2019 02:38 PM|mgebhard|LINK
After clicking the submit button, it still showing the same data but I have change the data. Everything is clearly evident in the screen shot.
Correct and by design. HTML helpers read the Model State which is populated by the model binding. The model state error has the state of the model as submitted along with any errors. This makes error handling easier.
You can get past this by clearing the ModelState but that causes other design considerations.
A POST action usually does an INSERT/UPDATE. The result is commonly a redirect to listing or confirmation page. IMHO, it is uncommon to face this situation in a real world application. However, it easily found when testing.