---
title: "How do you implement custom exceptions in C#?"  
description: "How do you implement custom exceptions in C#?"  
author: "Ponu Maurya"  
published: 2025-06-25  
updated: 2025-06-25  
canonical: https://www.mindstick.com/interview/34287/how-do-you-implement-custom-exceptions-in-c-sharp  
category: "c#"  
tags: ["c#"]  
reading_time: 1 minute  

---

# How do you implement custom exceptions in C#?

**Answer:**\
Inherit from `Exception` and add custom properties if needed.

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

Throw using:

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

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

## Answers

### Answer by Ponu Maurya

**Answer:**\
Inherit from `Exception` and add custom properties if needed.

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

Throw using:

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

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


---

Original Source: https://www.mindstick.com/interview/34287/how-do-you-implement-custom-exceptions-in-c-sharp

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