View

<form method="post">
    @(await Html.SimpleGrid(Model.Take(5))
        .AddColumn(col => col
            .HeaderCheckboxAll("Names")
            .DisplayAs(model => $"<input name='Names' type='checkbox' value='{model.Name}' />")
            .Encoded(false))
        .AddColumnsForModel()
        .RenderAsync())
    <button class="btn btn-primary">Submit</button>
</form>

Controller

[HttpPost, ValidateAntiForgeryToken]
public IActionResult Forms(string[] names)
{
    return View(MovieQuery).Success($"You selected: {string.Join(", ", names)}");
}