> c#_troubleshooting
c#
C# .NET runtime exceptions and compiler errors.
5 errors·category: language·updated june 2026
#codeproblemseveritypopularity
- 01NullReferenceExceptionNullReferenceException: object reference is nullcritical95
- 02IndexOutOfRangeExceptionIndexOutOfRangeException: index was outside array boundscritical84
- 03ArgumentNullExceptionArgumentNullException: value cannot be nullworkaround82
- 04FormatExceptionFormatException: input string format is invalidworkaround81
- 05InvalidCastExceptionInvalidCastException: specified cast is not validworkaround80
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- · Cross-referenced with the official c# docs and GitHub issues.
- · Fixes verified against top-voted Stack Overflow answers and high-reaction GitHub comments.
- · Reviewed and refreshed as new c# versions ship and reader corrections come in.
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