What is the difference between String and string in C#?

In C#, there is no functional difference between String and string. Both refer to the same type, System.String, and are compiled in the same manner. However, there are some contextual and stylistic differences that are worth noting:

1. Alias vs. Class Name:

   • string is a keyword in C# and is an alias for System.String[1][4][9].
   • String refers to the System.String class in the .NET Framework[1][4][9].

2. Usage:

   • string is typically used for declaring variables and for most string operations in C# code. It is more idiomatic and preferred in C# programming[1][4][9].
   • String is used when you need to reference the class explicitly, such as when calling static methods like String.Concat() or when using the class in a fully qualified manner[1][4][9].

3. Code Examples:

   csharp Copy

   string s = "Hello";
   String st = "World";
   string result = String.Concat(s, st);
   Console.WriteLine(result); // Outputs "HelloWorld"

4. Consistency:

   • Using string ensures consistency and readability in your code, as it is the convention followed by most C# developers[1][4][9].

In summary, while string and String are interchangeable in terms of functionality, string is preferred for variabl...