@model List<PlumbingCalculation>

<form method="post" asp-action="IncludeCalculationSelectData" asp-controller="Plumbing" asp-route-id="@ViewBag.Id">
        <table class="table">
                <tbody>
                @{foreach (PlumbingCalculation item in Model)
                    {
                        <tr>
                            <td>
                                <input type="checkbox" value="true" name="col" />
                                <input type="hidden" value="false" name="col" />
                            </td>
                            <td>
                                <input type="hidden"  name="col" asp-for="@item.CalculationName" />
                                @item.CalculationName
                            </td>
                        </tr>
                    }
                }
            </tbody>
        </table>
        <br />
        <input type="submit" class="btn btn-default" value="Далее" />
    </form>

public class PlumbingCalculation
    {
        public int PlumbingCalculationId { get; set; }
        public int PlumbingMainId { get; set; }
        public string CalculationName { get; set; }
        //
        [NotMapped]
        public bool isChecked { get; set; }

        public PlumbingMain PlumbingMain { get; set; }
    }

[HttpPost]
        public IActionResult IncludeCalculationSelectData(int id, List<PlumbingCalculation> col)
        {
                     ViewBag.count = names.Count();
                     return View("test");
        }

@{foreach (PlumbingCalculation item in Model)
                    {
                        <tr>
                            <td>
                                <input type="checkbox" value="true" name="checkbox" />
                                <input type="hidden" value="false" name="checkbox" />
                            </td>
                            <td>
                                <input type="hidden"  name="CalculationName" asp-for="@item.CalculationName" />
                                @item.CalculationName
                            </td>
                        </tr>
                    }
                }

[HttpPost]
        public IActionResult IncludeCalculationSelectData(int id, List<bool> checkbox, List<string> CalculationName )
        {
                     ViewBag.count = CaclulationName.Count();
                     return View("test");
        }