What are industry standard best practices for implementing custom exceptions in C#? -

what industry standard best practices implementing custom exceptions in c#?

i have checked google , there's great number of recommendations, don't know ones hold more credibility.

if has links authoritative articles, helpful.

the standard creating custom exceptions derive exception. can introduce own properties/methods , overloaded constructors (if applicable).

here basic example of custom connectionfailedexception takes in parameter specific type of exception.

[serializable] public class connectionfailedexception : exception {     public connectionfailedexception(string message, string connectionstring)         : base(message)     {         connectionstring = connectionstring;     }      public string connectionstring { get; private set; } } 

in application used in scenarios application attempting connect database e.g.

try {     connecttodb(aconnstring); } catch (exception ex) {     throw new connectionfailedexception(ex.message, aconnstring); } 

it's handle connectionfailedexception @ higher level (if applicable)

also have @ designing custom exceptions , custom exceptions