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What is the difference between string and String?

In C#, 'string' and 'String' are synonymous and represent the same data type. Both 'string' and 'String' refer to the built-in data type for representing textual data, which is a sequence of characters.

The only difference between 'string' and 'String' is their casing. In C#, the language is case-sensitive, so 'string' is the C# keyword for the data type, while 'String' is the corresponding alias provided by the .NET Framework.

When you declare a 'string' variable, you can use either 'string' (lowercase) or 'String' (uppercase): 


string message1 = "Hello, World!"; // Using 'string' keyword
String message2 = "Hello, World!"; // Using 'String' alias

The C# compiler treats 'string' and 'String' as identical, and there is no difference in how they function. However, the general convention in C# programming is to use 'string' (all lowercase) for declaring string variables, as it aligns with C#'s built-in type naming conventions (e.g., 'int', 'bool', 'float', etc.). Using the string keyword also helps maintain consistency throughout the codebase.

For readability and consistency, it's recommended to use 'string' (all lowercase) when declaring 'string' variables in C#. However, if you accidentally use 'String' (with uppercase), the code will still work without any issues.

If we declare a variable with 'string' and right click on it and select “go to definition” then you will see that the actual class is capital string i.e. 'String' as mentioned below:

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