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home / developersection / interviews / what is the difference between 'string' and 'string' in c#?
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What is the difference between 'String' and 'string' in C#?

Ravi Vishwakarma 1121 11 Jun 2024
c# c#.net
Updated 11 Jun 2024
Ravi Vishwakarma
Ravi Vishwakarma

Software Developer

Hi, my self Ravi Vishwakarma. I have completed my studies at SPICBB Varanasi. now I completed MCA with 76% form Veer Bahadur Singh Purvanchal University Jaunpur. SWE @ MindStick | Software Engineer | Web Developer | .Net Developer | Web Developer | Backend Engineer | .NET Core Developer

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1 Answers

Ravi Vishwakarma
Ravi Vishwakarma 11 Jun 2024
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String (with capital 'S'):

  • 'String' refers to the .NET Framework class representing a string of characters. It's part of the System namespace: System.String.
  • As a class, 'String' provides various methods and properties for working with strings, such as Substring(), Length, IndexOf(), etc.
  • It's generally used when referring to the class itself or when you need to specify the type explicitly.

string (with lowercase 's'):

  • 'string' is a C# keyword and an alias for the 'String' class. It's used to declare variables that hold string data.
  • It's commonly used when declaring variables, parameters, or return types dealing with string data.
  • Since C# is case-sensitive, 'string' is not interchangeable with 'String' when specifying types. It's purely a syntactical difference.

Here's an example demonstrating the use of 'String' and 'string':

using System;
namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            String str1 = "Hello";  // Using String class explicitly
            string str2 = "World";  // Using string keyword

            // Both variables hold the same type of data
            Console.WriteLine(str1);  // Output: Hello
            Console.WriteLine(str2);  // Output: World
        }
    }
}

In practice, you'll often see 'string' used for variable declarations and 'String' used when referring to the class itself or when explicit type specification is necessary. However, both refer to the same string data type in C#.

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