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C# String.Contains() Method with Example

In this tutorial, we will learn about the String.Contains() method with its usage, syntax, and examples. By IncludeHelp Last updated : April 07, 2023

C# String.Contains() Method

The String.Contains() method is used to check whether a given string contains a substring or not, we can use this method when we need to check whether a part of the string (substring) exists in the string.

Syntax

bool String.Contains(String substring);

The method is called with "this" string i.e. the string in which we have to check the substring.

Parameter(s)

• substring – is the part of the string to be checked.

Return Value

bool – it returns "True" if substring exists in the string or it returns "False" if substring does not exist in the string.

Note: This method is case-sensitive.

Input/Output Example

Input:
string str  = "Hello world!";
string str1 = "world";
string str2 = "Hi";
    
Function call:
str.Contains(str1);
str.Contains(str2);

Output:
True
False

C# String.Contains() Method Example 1

using System;

class IncludeHelp {
  static void Main() {
    // declaring string variables
    string str = "Hello world!";
    string str1 = "world";
    string str2 = "Hi";

    // checking substring
    Console.WriteLine("str.Contains(str1): " + str.Contains(str1));
    Console.WriteLine("str.Contains(str2): " + str.Contains(str2));
  }
}

Output

str.Contains(str1): True
str.Contains(str2): False

C# String.Contains() Method Example 2

using System;

class IncludeHelp {
  static void Main() {
    // declaring string variables
    string address = "102, Nehru Place, New Delhi, India.";
    string area1 = "Nehru Place";
    string area2 = "Sant Nagar";

    //checking and printing the result
    if (address.Contains(area1)) {
      Console.WriteLine(area1 + " exists in the address " + address);
    } else {
      Console.WriteLine(area1 + " does not exist in the address " + address);
    }

    if (address.Contains(area2)) {
      Console.WriteLine(area2 + " exists in the address " + address);
    } else {
      Console.WriteLine(area2 + " does not exist in the address " + address);
    }
  }
}

Output

Nehru Place exists in the address 102, Nehru Place, New Delhi, India.
Sant Nagar does not exist in the address 102, Nehru Place, New Delhi, India.

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