---
title: "Causes of runtime errors in .Net core APIs?"  
description: "Causes of runtime errors in .Net core APIs?"  
author: "Sandra Emily"  
published: 2023-08-28  
updated: 2023-08-29  
canonical: https://www.mindstick.com/forum/159701/causes-of-runtime-errors-in-dot-net-core-apis  
category: ".net core"  
tags: ["error", "asp.net core", ".net core", ".net core api"]  
reading_time: 2 minutes  

---

# Causes of runtime errors in .Net core APIs?

[Causes](https://yourviews.mindstick.com/view/293/renovation-causes-wastage-of-resources) of [runtime errors](https://www.mindstick.com/forum/159889/how-can-i-debug-javascript-runtime-errors-in-my-web-applications) in .Net [core APIs](https://www.mindstick.com/forum/160208/how-entity-framework-core-simplify-database-access-in-dot-net-core-apis)?

## Replies

### Reply by Aryan Kumar

There are many possible causes of [runtime](https://www.mindstick.com/articles/52/creating-timer-at-runtime-in-c-sharp-dot-net) [errors](https://answers.mindstick.com/qa/116170/fresh-fir-against-gandhis-in-national-herald-case-cover-up-for-ed-s-own-errors) in .NET Core API. Some of the most common causes include:

- **Invalid input data:** This is one of the most common causes of runtime errors. Invalid input data can cause errors in a variety of ways, such as causing a divide by zero error or an array index out of bounds error.
- **Null reference errors:** Null reference errors occur when a variable that is expected to contain a value is null. This can happen if the variable is not initialized or if the value is set to null.
- **Type mismatch errors:** Type mismatch errors occur when two variables of different types are used in an operation. For example, trying to add an integer and a string would cause a type mismatch error.
- **Out of memory errors:** Out of memory errors occur when the application runs out of memory. This can happen if the application is allocating too much memory or if the operating system is running low on memory.
- **Divide by zero errors:** Divide by zero errors occur when a number is divided by zero. This is an illegal operation and will cause a runtime error.
- **Array index out of bounds errors:** Array index out of bounds errors occur when an attempt is made to access an element of an array that is outside of the bounds of the array.

These are just some of the most common causes of runtime errors in .NET Core API. To avoid runtime errors, it is important to carefully code your application and to test it thoroughly.

Here are some tips for avoiding runtime errors in .NET Core API:

- Use strong typing to prevent type mismatch errors.
- Use exception handling to catch and handle runtime errors gracefully.
- Use a debugger to step through your code and identify potential errors.
- Test your application thoroughly with a variety of input data.


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Original Source: https://www.mindstick.com/forum/159701/causes-of-runtime-errors-in-dot-net-core-apis

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