Скачать или смотреть Check If String Starts With 'www' in C# - Use StartsWith, Case-Insensitive Check & Null Safety Guide

🎥 Check String Starts with 'www' in C#
In this video, you’ll learn how to check whether a string begins with the prefix www in C#. We’ll demonstrate the built-in StartsWith method (with case-insensitive options), manual checks using Substring/indexing, and defensive checks for null or empty input. You’ll also see how to handle common real-world cases like optional http/https prefixes and mixed casing so your code behaves reliably on messy user input.
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Key Learning Points:
• Use string.StartsWith("www", StringComparison.OrdinalIgnoreCase) for robust prefix checks
• Perform manual index/substr checks when you need custom behavior or trimming
• Handle null or empty strings to avoid NullReferenceException and provide friendly feedback
• Consider and strip http:// or https:// before checking for www when appropriate
• Write a small reusable helper method that returns a boolean and is easy to unit-test
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What You’ll Need:
Basic C# knowledge — strings, conditionals, and console I/O. Any .NET environment like Visual Studio or VS Code will let you run and test examples.
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📚 Resources:
• string.StartsWith documentation and StringComparison options (Microsoft Docs)
• Substring / IndexOf usage for manual checks
• Defensive programming: null/empty checks and helper methods for clean code
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