How I can filter the dublecate data by date from controller to view

@using System.Data
@model DataTable


<input type="text" name="Datecall" id="Datecall" placeholder="Date" required="" />
<input type="button" id="btnsearch" name="btnsearch" class="form-control" value="Chart" style="color:green" />

<table cellpadding="5" id="employeeTable" cellspacing="5" border="1">
    <tr style="background-color:aliceblue">
        <th>EmployeeName</th>
        <th>Duplecated</th>
    </tr>
    @foreach (DataRow dr in Model.Rows)
    {
        <tr>
            <td>@dr["EmployeeName"]</td>
            <td>@dr["Duplecated"]</td>
        </tr>
    }
</table>

Uncaught ReferenceError: ko is not defined

public ActionResult xternal(string Datecall)
        {
            DataTable dt = new DataTable();
            string str = "Data Source=MAHGOUBND4;Initial Catalog=CTC_Mahgoub;Persist Security Info=True;User ID=sa;Password=ah987987987;";
            using (SqlConnection cn = new SqlConnection(str))
            {
               
                using (SqlCommand cmd = new SqlCommand(" SELECT EmployeeName, COUNT(EmployeeName) as 'Duplecated'  FROM [dbo].[cs] WHERE Datecall LIKE 'Datecall' GROUP BY EmployeeName HAVING COUNT(EmployeeName) > 1; "))

                {
                    cmd.Connection = cn;
                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        da.Fill(dt);
                    }
                }
            }
            return View(dt);

        }