Not being passed from Index.cshtml back to HomeController.cs

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C#

ASP.NET

MVC

The data is not being passed from Index.cshtml back to HomeController.cs.

The data is populated initially into the table correctly (code omitted for brevity).

The "@Url.Action("Delete", new{ testID = item.testID }) is not returning the data back to the controller.

Index.cshtml

@model MDFtoMVCdelete.Models.DeleteModel

<center>
    <table>
        @foreach (var item in Model.thistable)
        {
             <tr><td>@item.testID</td><td>@item.datetime</td><td>@item.col1</td><td>@item.col2</td><td>@item.col3</td><td><form action="@Url.Action("Delete", new{ testID = item.testID })" method="delete"><input type="submit" value="Delete" /></form></td></tr>
        }
    </table>
</center>

HomeController.cs

public ActionResult Delete(int testID)
        {
            //code omitted for brevity
            return View();
        }

Errorcode:

The parameters dictionary contains a null entry for parameter 'testID' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Delete(Int32)' in 'MDFtoMVCdelete.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters