Guard clauses in .NET are a simple yet powerful technique to improve code readability and maintainability. By handling errors and edge cases early, guard clauses prevent deep nesting and make your code cleaner and easier to understand.

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Guard clauses in .NET are used to ensure code robustness, maintainability, and readability by handling invalid input at the beginning of methods and reducing nested code. Using libraries like Ardalis.GuardClauses can simplify their implementation and allow for custom guard definitions, leading to cleaner and more maintainable code.

Introduction to Guard Clauses in .NET