Index

C# String

In C#, a string is used to store text. It represents a sequence of characters and is one of the most commonly used reference types.

Strings in C# are immutable, which means their value cannot be changed once created.

Creating Strings


// String declaration
string name = "Rahul";
string message = "Welcome to C#";

Common String Methods

Method	Description	Example
Length	Returns string length	name.Length
ToUpper()	Converts to uppercase	name.ToUpper()
ToLower()	Converts to lowercase	name.ToLower()
Trim()	Removes extra spaces	name.Trim()
Substring()	Extracts part of string	name.Substring(0, 3)
Replace()	Replaces text	message.Replace("C#", "DotNet")
Contains()	Checks text existence	message.Contains("C#")

Example


string text = "  Hello World  ";

Console.WriteLine(text.Length);
Console.WriteLine(text.Trim());
Console.WriteLine(text.ToUpper());
Console.WriteLine(text.Substring(2, 5));

String Concatenation

Combining strings together.


string firstName = "Rahul";
string lastName = "Sharma";

string fullName = firstName + " " + lastName;
Console.WriteLine(fullName);

String Interpolation

A cleaner way to format strings using $.


int age = 25;
Console.WriteLine($"My age is {age}");

Key Points

Strings are reference types
Strings are immutable
Rich set of built-in methods
String interpolation improves readability

Conclusion

Strings play a vital role in handling text data in C#. Understanding string methods and formatting techniques helps in writing clean and efficient code.