Cannot connect to MS SQL 2008 R2 locally or remotely - Error 53

• A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 53)

  solution

  Error 53 sql server 2008 r2

  
  

  To enable a server network protocol

  1.
  

  In SQL Server Configuration Manager, in the console pane, expand SQL Server Network Configuration.

  
  

  2.

  In the console pane, click Protocols for <instance name>.

  
  

  3.

  In the details pane, right-click the protocol you want to change, and then click Enable or Disable.

  
  

  4.

  In the console pane, click SQL Server Services.

  
  

  5.

  In the details pane, right-click SQL Server (<instance name>), and then click Restart, to stop and restart the SQL Server service.

  
  

  http://msdn.microsoft.com/en-us/library/ms191294.aspx

  
  

  
  

  
  

Login from SQL-server in ASP.Net C#

    private bool SiteLevelCustomAuthenticationMethod(string UserName, string Password)
    {

        bool boolReturnValue = false;

        string strConnection = ConnectionString;

        SqlConnection Connection = new SqlConnection(strConnection);
        string strUserID = UserName;
        String strSQL = "select * from UserDetails where UDUSRID=\'" + (strUserID + "\'");
        SqlCommand command = new SqlCommand(strSQL, Connection);
        SqlDataReader Dr;
        Connection.Open();
        Dr = command.ExecuteReader();
        while (Dr.Read())
        {
            string UserNameDB = Dr["UDUSRID"].ToString();
            string PasswordDB = Dr["UDPASSWD"].ToString();
            //  string UserRoleDB = Dr["UDROLE"].ToString();


            if ((UserName == UserNameDB.TrimEnd().TrimStart()) & (Password == PasswordDB.TrimEnd().TrimStart()))
            {
                Session["Usrid"] = UserNameDB;
                Session["Uspasswd"] = PasswordDB;
                //    Session["Usrole"] = UserRoleDB;
                //  Response.Write(Session["Usrole"]);
                // Response.End();

                boolReturnValue = true;
                break;

            }

        }

        Dr.Close();

        return boolReturnValue;

    }

Send email in a format c#

    void sndemail()
    {
        MailMessage objEmail = new MailMessage();
        objEmail.To = "xxxxx@xxxxxx.com";//Session["OEMAL"].ToString().Trim();//Emald.ToString().Trim();//txtTo.Text;
        //objEmail.To = "dostind@gmail.com";//Session["OEMAL"].ToString().Trim();//Emald.ToString().Trim();//txtTo.Text;
   
        //objEmail.From = "rajeev@xxxxxx.net";
        objEmail.From = "noreply@xxxxxx.com";

        //objEmail.Cc = txtCc.Text;
        objEmail.Subject = "HI -- Notification";// +Strrslt.ToString();
        //Response.Write(Session["oename"].ToString());  HI Quiz – Course Completion Notification
        //Response.End();
        //objEmail.Body = "<table border=1 bgcolor=#F3EFE0><tr><td>Date :</td><td><b>" + DateTime.Today.ToLongDateString() + "</td></tr><tr><td>Exam Id:</td><td>" + Request["id"].ToString() + "</td></tr><tr><td>Trainee:</td><td> </b> " + Session["repname"].ToString() + "</td></tr><tr><td>Total Correct:</td><td>" + cortans + " Out of:-" + totrec + "</td></tr><tr><td>Owner: </td><td>" + Session["oename"].ToString() + "</td></tr><tr><td>Program:</td><td>Home Impovement</td></tr><tr><td><b>Result:</b></td><td><b>" + Strrslt.ToString() + "</b></td></tr>  </table>";
        objEmail.Body = "<b>The following trainee has completed the Home Improvement training course:</b><br><br>";
        objEmail.Body += "<table border=0 width=50%   bgcolor=#CCCCCC cellpadding=10 ><tr><td>Trainee :</td><td><b>" + Session["repname"].ToString() + "</td></tr><tr><td>Market:</td><td>" + Session["oeMarket"].ToString() + "</td></tr><tr><td>ICD:</td><td> </b> " + Session["owniNam"].ToString().Replace("'"," ") + "</td></tr><tr><td>Date:</td><td>" + DateTime.Today.ToLongDateString() + "</td></tr><tr><td>Total Correct: </td><td>" + cortans + " Out of:-" + totrec + "</td></tr><tr><td><b>Status:</b></td><td><b>" + Strrslt.ToString() + "</b></td></tr>  </table>";
      
        //objEmail.Body = Label4.Text;

        //objEmail.Priority = MailPriority.High;
        objEmail.BodyFormat = MailFormat.Html;//MailFormat.Html; Session["oeMarket"]
        // Make sure you have appropriate replying permissions from your local system

       SmtpMail.SmtpServer = "10.0.10.123";
        //SmtpMail.SmtpServer = "localhost";

        try
        {
            SmtpMail.Send(objEmail);


        }
        catch (Exception exc)
        {
            Response.Write("Send failure: " + exc.ToString());
        }

    }


    private string ConnectionString
    {
        get
        {
            string connectionString = ConfigurationManager.ConnectionStrings["smdbConnectionString51"].ConnectionString;
            return connectionString;
        }
    }

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