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

In C#, String and string are used interchangeably to represent a sequence of characters. Both String and string are aliases for the System.String class in the .NET Framework.

The only difference between String and string is that String is a reference type and string is a keyword alias for the System.String class. This means that String is a class and can be used with object-oriented programming concepts like inheritance and polymorphism, while string is just a keyword that refers to the same class.

For example, the following two lines of code are equivalent:

csharp
String myString = "Hello World";
string myString = "Hello World";

In general, it is recommended to use the string keyword instead of String because it is more concise and consistent with other C# keywords.

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