string value is saving as null in database

Question

Data type of column in database table is nvarchar(max) and allow null is checked.

 

This is my code.

 

This is my ajax post request.

$.ajax({
url: "/Home/SaveAnswer",
type: 'POST',
data: {
"ProjectId": "1",
"QuestionId": qId,
"Answer": text + ',' + rate,
},
cache: false,

}).done(function (response) {

console.log(response);

}).fail(function (e) {
console.log(e);
});
});

Code in controller

[HttpPost]
public string SaveAnswer(AnswerVM model)
{
string msg = "";
try
{
using(MyDbContext context = new MyDbContext())
{
Answer ans = null;

if(ModelState.IsValid)
{

ans = context.Answers.FirstOrDefault(a => a.ProjectId == model.ProjectId && a.QuestionId == model.QuestionId);

if(ans != null)
{
ans.Answer1 = model.Answer;
msg = "ans is not null - {" + ans.Answer1 + "}";
}
else
{

ans = new Answer();
ans.Answer1 = model.Answer;
ans.ProjectId = model.ProjectId;
ans.QuestionId = model.QuestionId;
context.Answers.Add(ans);

msg = "ans is null - {" + ans.Answer1 + "}";
}
context.SaveChanges();
}
}

return msg;
}
catch(System.Exception ex)
{

return ex.Message;
}
}