protected void BtnID_Click(object sender, EventArgs e)
    {
        int id = Convert.ToInt32(TextBoxID.Text);
        try
        {

            List<ASPWebApp.CottagesServiceReference.Cottages> cottages = ws.GetCottageInfoByID(id).ToList();

            ListItem cottage = new ListItem(String.Join(".", cottages));

            BulletedList1.Items.Add(cottage);

            BulletedList1.DataSource = cottages;
            BulletedList1.DataBind();


        }
        catch (Exception a)
        {
            Console.WriteLine(a);
        }
    }

public List<Cottages> GetCottageInfoByID(int id)
    {
        List<Cottages> cottage = new List<Cottages>();

        SqlConnection conn = new SqlConnection(dataSource);

        string sqlQuerySelectCottageInfo = "SELECT Cottage_Name as 'Name', Cottage_Location as Location, No_Of_Rooms as Rooms, Description, Cost_Per_Night as Cost FROM dbo.Cottages where Cottage_ID = @id";

        SqlCommand cmd = new SqlCommand(sqlQuerySelectCottageInfo);
        cmd.Parameters.AddWithValue("@id", id);

        conn.Open();

        cmd.Connection = conn;

        SqlDataReader reader = cmd.ExecuteReader();


        while (reader.Read())
        {
            if (!reader.HasRows)
            {
                throw new Exception("No Cotteges Found");
            }
            else
            {

                cottage.Add(new Cottages()
                {
                    Name = (reader[("Name")].ToString()),
                    Location = (reader[("Location")].ToString()),
                    Rooms = Convert.ToInt32(reader[("Rooms")]),
                    Cost = Convert.ToDecimal(reader[("Cost")]),
                    Description = (reader[("Description")].ToString()),

                });

            }

        }

        reader.Close();

        conn.Close();

        return cottage;
    }

<td class="Column2" colspan="1">
                <asp:TextBox class="TxtID" ID="TextBoxID" runat="server" BorderColor="Gray" BorderStyle="Solid" BorderWidth="2px" CausesValidation="False"></asp:TextBox>
                <asp:Button class="BtnID" ID="BtnID" runat="server" Text="Search" OnClick="BtnID_Click" />
                <asp:BulletedList class="Bullets" ID="BulletedList1" runat="server">
                </asp:BulletedList>
            </td>