[Solved] jQuery AJAX post parameter passed NULL to Controller in ASP.Net Core MVC

hi

I created a simple project with  .Net Core 5 and try to use telerik grid

list data to grid ( work )  post data with ajax ( not work )

when I try to post data to controller and the controller show no data ( count=0)

where am i doing wrong

If I added a [FromBody] tag its working, but same structure working earlier version like 2, 3.

thank you

all structure like below

// Controller
public IActionResult GetData()
{
  var model = new TestModel();     
 
  return View(model);
}
 
[HttpPost]
public IActionResult GetData([DataSourceRequest] DataSourceRequest request)
{
 
var query="SELECT ID,NAME,SURNAME FROM TABLE";
 
var dt = GetDataFromDatatable(query);
 
    var model  = (from DataRow dr in dt.Rows
           select new TestModel
           {                
             ID = Convert.ToInt32(dr[0]),
             NAME = dr[1].ToString(),
             SURNAME = dr[2].ToString()               
 
           }).ToList();     
 
    return new JsonResult(model.OrderBy(x => x.NAME).ToDataSourceResult(request), new Newtonsoft.Json.JsonSerializerSettings());
}
 
 
public JsonResult SendData(List<TestModel> modelList)
{
  //Do Semething.
  return Json(new { data = modelList }, new Newtonsoft.Json.JsonSerializerSettings());
}

// View
<button id="btnSend">Send</button>
    @(Html.Kendo().Grid<TestModel>()
        .Name("gridTest")
        .AutoBind(true)
        .Columns(columns =>
        {
            columns.Bound(p => p.ID).Width(50);
            columns.Bound(p => p.NAME).Width(100);
            columns.Bound(p => p.SURNAME).Width(100);
        })
 
        .DataSource(source => source
            .Ajax().ServerOperation(false)
 
            .Model(model =>
            {
                model.Id(p => p.ID);
 
            })
            .PageSize(17)
            .Read(read => read.Action("GetData", "Tests"))
        )
        )
    )
)   
 
// Ajax Call
$(document).ready(function () {
    $("#btnSend").click(function (e) {
        e.preventDefault();
        var modelList = [];
        $.each($(".k-grid-content tbody tr"), function () {                      
            var grid = $('#gridTest').data('kendoGrid');
            var selectedRow = grid.dataItem(this);
            modelList.push(selectedRow);                    
        });              
 
        console.log(modelList);
 
        $.ajax({
            type: "POST",
            url: '/Tests/SendData',
            data: JSON.stringify({modelList}),
            contentType: "application/json; charset=utf-8",
            dataType: 'json',
            success: function (data) {                       
            },
            error: function (data) {                       
            }
        });           
    });
});