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How to post a WebGrid to a Controller using Ajax

I want to post the full WebGrid from my view to my controller using ajax. In this WebGrid I display a table from a database and I want to provide, that the user of this webpage can update the columns (in the database).

WebGrid

WebGrid

My try so far:

public JsonResult UpdateTable(GridView model)
{
// Update Model to db..
string message = "Success";
return Json(message, JsonRequestBehavior.AllowGet);
}


The GridView model here has always 0 columns.

GridView model

WebGrid

<div id="tableGridDiv">
@grid.GetHtml(
tableStyle: "table", columns: cols)
</div>


Script

$('.save-user').on('click', function () {
var grid = $("#tableGridDiv").find("table.grid").first();
alert(grid.innerHTML);
var jsonGrid = JSON.stringify(grid);
//var jsonGrid = $.parseJSON(grid);
alert(jsonGrid);
$.ajax({
url: '/Home/UpdateTable/',
data: jsonGrid,
datatype: JSON,
type: 'POST',
contentType: 'application/json, charset=utf-8',
success: function (data) {
alert(data);
}
});


The outcome of alert(jsonGrid) is:

alert(jsonGrid)

{"length":0,"prevObject":{"length":0,"prevObject":{"0":{"__browserLink_sourceMapping":["~/Views/Home/ViewTable.cshtml","div#tableGridDiv",4717,104,23]},"length":1,"context":{"location":{"href":"http://localhost:56452/Home/ViewTable?View=0","ancestorOrigins":{},"origin":"http://localhost:56452","protocol":"http:","host":"localhost:56452","hostname":"localhost","port":"56452","pathname":"/Home/ViewTable","search":"?View=0","hash":""},"_html5shiv":1,"jQuery110201336937122154982":1},"selector":"#tableGridDiv"},"context":{"location":{"href":"http://localhost:56452/Home/ViewTable?View=0","ancestorOrigins":{},"origin":"http://localhost:56452","protocol":"http:","host":"localhost:56452","hostname":"localhost","port":"56452","pathname":"/Home/ViewTable","search":"?View=0","hash":""},"_html5shiv":1,"jQuery110201336937122154982":1},"selector":"#tableGridDiv table.grid"},"context":{"location":{"href":"http://localhost:56452/Home/ViewTable?View=0","ancestorOrigins":{},"origin":"http://localhost:56452","protocol":"http:","host":"localhost:56452","hostname":"localhost","port":"56452","pathname":"/Home/ViewTable","search":"?View=0","hash":""},"_html5shiv":1,"jQuery110201336937122154982":1}}

I can't see columns or anything like that in here, so I guess I need something different?

jsonGrid

GridView

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