Подключение к БД и ошибка "стандартные параметры SQL Server не разрешают удаленные подключения"

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.Configuration;
using System.Data.SqlClient;
 
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
 
        
 
        string connectionString = WebConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
        SqlConnection con = new SqlConnection(connectionString);
 
        try
        {
            // Try to open the connection.
            con.Open();
            lblInfo.Text = "<b>Server Version:</b> " + con.ServerVersion;
            lblInfo.Text += "<br /><b>Connection Is:</b> " + con.State.ToString();
        }
        catch (Exception err)
        {
            // Handle an error by displaying the information.
            lblInfo.Text = "Error reading the database. " + err.Message;
        }
        finally
        {
            // Either way, make sure the connection is properly closed.
            // Even if the connection wasn't opened successfully,
            // calling Close() won't cause an error.
            con.Close();
            lblInfo.Text += "<br /><b>Now Connection Is:</b> " +
            con.State.ToString();
        }
 
    }
}