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In C#, the concept of a HashMap is often implemented using the Dictionary class. This data structure allows for fast retrieval of values based on unique keys. Each key is mapped to a specific value, and with the help of hashing, these key-value pairs can be efficiently stored and accessed. Although C# does not have a class explicitly called HashMap like Java, the Dictionary class serves the same purpose, providing a robust and type-safe way to manage data.

The primary advantage of using a Dictionary in C# is its ability to quickly search, add, and remove elements while ensuring that each key is unique. This makes it ideal for scenarios where fast lookups are essential, such as caching and mapping data.

For a more in-depth explanation and code examples on how to use HashMaps (Dictionaries) in C#, check out the full article on Understanding HashMap in C#.