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);