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How do you implement custom exceptions in C#?

Ponu Maurya 1103 25 Jun 2025
c# c#
Updated 25 Jun 2025
Ponu Maurya
Ponu Maurya

Student

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Ponu Maurya
Ponu Maurya 25 Jun 2025
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Answer:
Inherit from Exception and add custom properties if needed.

public class InvalidOrderException : Exception {
    public InvalidOrderException(string msg) : base(msg) { }
}

Throw using:

throw new InvalidOrderException("Order ID is invalid.");

Always include Serializable and override constructor if exception will cross AppDomains.

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