Coded String Conversion in C# — Encode/Decode Base64, URL, Caesar & ROT13 with Validation Guide...!!
🎥 Coded String Conversion in C#
In this video, you’ll learn how to convert strings into several coded forms and back again using C#. We’ll cover common encodings (Base64, URL encoding), simple ciphers (Caesar, ROT13), and safe handling for input and edge cases. You’ll see when to use built-in .NET APIs vs custom code, how to validate and sanitize input, and how to decode reliably for real-world utilities and small security-minded tools.
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Key Learning Points:
• Encode and decode Base64 safely and recognize when to use it (binary ↔ text conversion)
• Perform URL encoding/decoding for safe transport in query strings and paths
• Implement simple ciphers (Caesar, ROT13) for learning and lightweight obfuscation — and understand their limitations
• Validate and sanitize input, detect invalid encoded data, and handle exceptions (FormatException, etc.)
• Choose the right types (byte[] vs string) and convert between text and bytes reliably (Encoding.UTF8)
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What You’ll Need:
Basic C# knowledge — strings, byte arrays, and familiarity with System.Text/System.Convert. Visual Studio, VS Code, or any .NET-capable editor with the .NET SDK will let you run and test the examples.
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📚 Resources:
• Base64 encoding/decoding overview and Convert.ToBase64String / Convert.FromBase64String docs
• System.Web.HttpUtility.UrlEncode / Uri.EscapeDataString for URL encoding considerations
• Simple cipher theory (Caesar, ROT13) and why they’re not cryptographically secure
• System.Text.Encoding (UTF8) for byte/text conversion and error handling tips
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