Why Does Random.Next Return Identical Values for Different Instances?

Random Number Generation Inconsistencies: Identical Random.Next Outputs

This article addresses a common issue in C# where multiple instances of a class, each using Random.Next(), produce the same sequence of random numbers. This seemingly contradictory behavior occurs when multiple Random objects are instantiated in rapid succession.

The root cause is the default seeding mechanism of the Random class. It uses the system clock as a seed. If multiple Random objects are created within a very short time frame, they receive nearly identical seed values, leading to identical "random" number sequences.

The solution is straightforward: Instead of creating a new Random object for each instance, create a single Random object and reuse it across all instances. This single instance will generate a unique sequence of random numbers, resolving the issue of identical outputs. Pass this shared Random object as a parameter to the class's constructor.

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