JSON - JavaScript Object Notation

Combination of Showing MessageBox and select yes to backend.

  

JSON - Mostly use when UI to Backend

  <script type="text/javascript">

        function RedirectToEdit(userID) {

            $.ajax({

                type: "post",

                url: "Client.aspx/RedirectToEdit",

                contentType: "application/json; charset=utf-8",

                dataType: "json",

                data: '{"userID":"' + userID + '"}',

                success: function (result) {

                    window.parent.location.href = "Client.aspx?action=edit";

                },

                error: function (xhr, status, error) {

                    alert("Failed to go Edit Page.")

                }

            });

        }

JAVASCRIPT

        function DisplayClient() {

            var x = confirm('This User ID already exist. Press "Ok" to Edit Page.');

            if (x == true) {

                $('INPUT[id*=btnRedirectEdit]').click();

                var userID = $('INPUT[id*=txtUserID]').val();

                RedirectToEdit(userID);

            }

        }

    </script>

C# Backend

[System.Web.Services.WebMethod]

public static bool RedirectToEdit(string userID)

{

            ClientController clientController = new ClientController();

            UserSession upc = new UserSession();

            upc.SessionSelectedClientID = userID;

            upc.SessionSelectedModID = "*Client.aspx?action=edit";

            return true;

}

Way to Catch Exception ( Custom Exception)

OVERALL EXCEPTION 

Data Access Layer : Catch and Log 

catch (Exception ex)
{
  CommonLogger logger = new CommonLogger();
  logger.LogError(ExceptionType.DACException, ex);

   throw new DBException(SQL_STATEMENT, country.CountryID.ToString(), ex);
   //or
   throw new DBException(SQL_STATEMENT, "", ex);
}

Business Layer : No log and Catch (you can throw Exception, but better throw custom exception or application exception)

Service Layer : Catch, log and form fault exception(if want to catch business layer exception, you want to catch another 1)

//Normal Exception

catch (Exception ex)

{

  string message = "Error retrieving Country. " +

((ex.GetType() == typeof(DBException)) ? "Unable to retrieve data from database.": "An exception occurred.");

   CommonLogger logger = new CommonLogger();

   logger.LogError(ExceptionType.Country, ex);

   PYFault fault = new PYFault(message);

   throw new FaultException<PYFault>(fault, message);

}

//Custom Exception

catch (PYException vex)

{

  PYResultFault fault = new PYResultFault(vex.Message, vex.PYResults);

  throw new FaultException<PYResultFault>(fault);

}

HOW TO CREATE FAULT EXCEPTION

[DataContract]

public class PYResultFault

{

      [DataMember]

      public List<PYResult> PYResults { get; set; }

      [DataMember]

      public string Message { get; set; }

       public PYResultFault(string message, List<PYResult> pyResults)

       {

            this.Message = message;

            this. PYResults = pyResults;

       }

}

Controller Layer : Catch (you can throw Exception, but better throw custom exception or application exception)**Can use back the Custom Exception

catch (FaultException<PYFault> fex)   

{

  throw new PYException(fex.Detail.Message, fex);

}

catch (FaultException<PYResultFault> fex)

{

   throw new PYException(fex.Detail.Message, fex.Detail.PYResults); 

}

catch (Exception ex) //Catch Connection Error

{

  throw new Exception(ex.Message);

}

Presentation Layer : Catch and Log Presentation Error

catch (PYException validateEx)

{

  StringBuilder sbrError = new StringBuilder();

  sbrError.Append(validateEx.Message);

  

  if (validateEx.PYResults != null)

  {

     sbrError.Append(": <br />");

     foreach (var result in validateEx. PYResults)

     {

       sbrError.Append(result.Message + "<br />");

     }

  }

    ModelState.AddModelError("Error", sbrError.ToString());

}

catch (Exception ex)

{

     CommonLogger logger = new CommonLogger();

     logger.LogError(ExceptionType.CountryManagement, ex);

    

     ModelState.AddModelError("Error",ConfigurationManager.AppSettings.Get("generalErr"));

}

WHEN NEED USE THIS METHOD TO CATCH EXCEPTION
when the an exception form at Business Layer with a list of information need to show.

This method is included custom and fault exception.
Custom Exception used when form a list of exception.
Fault exception used when to Transfer whole exception from WCF.

Create Custom Exception

Create Custom exception

public class PYException : Exception

{

 public List<PYResult> PYResults { get; set;}  //attribute

 public PYException() { }  // Default Constroctor

 public PYException(string message) : base(message) { } //like Application Exception

public PYException(string message, List<PYResult> pyResults): base(message)

        {

          this.PYResults = pyResults;

        }  //Application Exception with A List of Info , message usually is header.

 public PYException(string message, Exception inner) : base(message, inner) { }

 public PYException(string message, List<PYResult> pyResults, Exception inner)

        : base(message, inner)

        {

            this.ValidationResults = validationResults;

        }

}

Create exception class

[DataContract]

public class PYResult

{

  [DataMember]

  public ComponentsType ComponentType { get; set; }

  [DataMember]

  public string key { get; set; }

  [DataMember]

  public string Message { get; set; }

}

HOW TO THROW THIS ?

Use IF ELSE statement to create a exception class.

List<PYResult> pyResults = new List<PYResult>();

pyResults.Add(new PYResult ()

{

Message = String.Format("The Country cannot be selected for {0}. The country .",country.CountryName),

  key = CountryID.ToString(),

  ComponentType = PYComponentsType.Country

});

Use count to throw the exception

if (pyResults.Count() > 0)

  throw new PYException ("Updating errors. Please see the error detail",pyResults);

XML ENTITIES

[DataMember]        

[XmlAttribute] 

[Browsable(false)]            //Not Display

[Category("Mandatory")]      // Must Display

[DisplayName("Code")]        // Display Name

public int CodeID { get; set; }