500 error Sending JSON to Controller MVC - asp.net-mvc

Question

I am trying to send JSON data to the controller and use the data to modify the database.
This is my ajax call:
var ajaxresult = [];
var table = $('<table>').addClass('table ');
$('button').on('click', function () {
$.ajax({
headers: {
"Content-Type": "application/json",
"Accept": "application/json"
},
type: 'GET',
url: 'https://api.github.com/search/repositories?q=repos+topic:' + $(this).attr('id') + '&sort=stars&order=desc&per_page=10',
success: function (data) {
ajaxresult.push(data);
debugger;
table.empty();
table.append("<thead><tr><th>Avatar</th><th>Name</th><th>Score</th><th>URL</th><th>Updated at</th></tr></thead>");
$.each(data.items, function (i, object) {
var row = $('<tr>').addClass('table-primary');
row.append('<td><img src=' + object.owner.avatar_url + 'height=50px width=50px/></td>');
row.append('<td>' + object.name + '</td>' + '<td>' + object.score + '</td>' + '<td>' + object.url + '</td>' + '<td>' + object.updated_at + '</td>');
table.append(row);
});
table.append('</table>');
$('table').replaceWith(table);
}
});
});
$('#save').on('click', function () {
debugger;
$.ajax({
contentType: 'application/json; charset=utf-8',
dataType: 'json',
type: 'POST',
url: 'http://localhost:60294/Git/Updateto',
data: ajaxresult,
success: function (data) {
alert('done');
},
error: function (data) {
alert('error');
}
});
});
This is the controller to which I am trying to POST the data:
[HttpPost]
public async Task<IActionResult> Updateto(List<gitd> obj,gitd gitd )
{
if (ModelState.IsValid)
{
foreach (var item in obj)
{
item.AvatarURL = gitd.AvatarURL;
item.Name = gitd.Name;
item.Score = gitd.Score;
item.Updatedat = gitd.Updatedat;
}
await _context.SaveChangesAsync();
}
return View(gitd);
}
}
This is the model which I want to use and save data to the database:
public class gitd
{
public int ID { get; set; }
public string AvatarURL { get; set; }
public string Name { get; set; }
public decimal Score { get; set; }
public DateTime Updatedat { get; set; }
}
I am getting a 500 Internal error, when I looked using the debugger, whenever the POST request is called. the control moves directly to the close of the ajax function. In the JQUERY XML, I could see that data is undefined and handleobj is undefined and all the post data becomes NULL.How do I resolve this?
As ajaxresult is a global variable,shoudl not the json data be there in the #save button ajax call?Why is the data NULL.
I also tried giving data inside the POST request as:
data:{
"name":"John",
"age":30,
"cars":[ "Ford", "BMW", "Fiat" ]
}
but still the error persists.