What are the type of Errors

In .NET, there are primarily three types of errors:

Compilation Errors

Compilation errors occur during the compilation phase of the code, indicating that the code violates the rules of the programming language or contains syntax errors. These errors prevent the code from being successfully compiled into an executable or assembly. Common compilation errors include missing or misplaced parentheses, semicolons, or incorrect variable declarations. Compilation errors must be fixed before the code can be executed.

Runtime Errors

Runtime errors, also known as exceptions, occur during the execution of a program. They are typically caused by unexpected or exceptional conditions that the program encounters during runtime. These errors can be due to various factors such as invalid input, division by zero, accessing null objects, or attempting to perform an operation that is not supported. When a runtime error occurs and is not properly handled, it can lead to program termination or undesired behavior. To handle runtime errors, exception handling mechanisms are used, such as try-catch blocks, to recover from exceptional conditions and prevent the application from crashing.

Logical Errors

Logical errors, also known as bugs, occur when the program's logic or algorithm is incorrect, resulting in unintended or incorrect behavior. These errors do not cause the program to crash or generate exceptions, but they lead to incorrect outputs or unexpected results. Logical errors can be challenging to identify and fix since they require careful examination of the code's logic and understanding of the expected behavior. Debugging techniques like stepping through the code, inspecting variables, and using logging can help in identifying and resolving logical errors.


It's important to note that these categories are not mutually exclusive, and errors in one category can sometimes lead to errors in another. Additionally, tools like debuggers, logging frameworks, and automated testing can aid in detecting and resolving errors in .NET applications.