How do I change item.col1, item.col2 and item.col3 to reflect the updated or changed value in the TextBox for the row the submit button is pressed

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C#

ASP.NET

MVC

How do I change item.col1, item.col2 and item.col3 to reflect the updated or changed value in the TextBoxes for the row the submit button is pressed?

Index.cshtml

@model IEnumerable<Editing.Models.Table1>

@using (Html.BeginForm("Index", "Home", new { Idt = item.Idt, col01 = item.col1, col02 = item.col2, col03 = item.col3       {
        <tr>
            <td>
                @Html.TextBoxFor(modelItem => item.Idt)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.datetime0)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.col1)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.col2)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.col3)
            </td>
            <td>

                    <input type="submit" id="Edit" value="Edit" />

            </td>
        </tr>
    }

HomeController.cs

public class HomeController : Controller
{
    private testContext db = new testContext();
    [HttpPost]
    public ActionResult Index(int Idt, string col01, string col02, string col03)
    {
            var dataToUpdate=db.Data1.SingleorDefault(o=> o.Idt ==Idt);
            dataToUpdate.datetime0=DateTime.Now.ToString();
            dataToUpdate.col1=col01;
            dataToUpdate.col2=col02;
            dataToUpdate.col3=col03;
            db.Entry(dataToUpdate).State=EntityState.Modified;
            db.SaveChanges();
            return View(db.Data1.ToList());
     }
}