Select all check box in Grid.MVC

Question

My code:-

@Html.Grid(Model).Columns(columns =>

{

columns.Add()

.Titled("<input name=allChk type=checkbox id=cbSelectAll />")

.Encoded(false)

.Sanitized(false)

.SetWidth(30)

.RenderValueAs(c => Html.CheckBox("checked", false, new { id = "checkBox" })).SetWidth(100);

columns.Add(c => c.inCosId, true);

columns.Add(c => c.vcCosCode).Titled("Country Code").Filterable(true);

}).WithMultipleFilters()