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As the name of the method says, the Contains() method of String class determines whether a specified String value is contained in the invoked String or not. If he searched String is found then the bool value True is returned, otherwise False is returned.

Explaining the Contains() method

Methods	Description
Contains(String str)	This method determines if a specific String value is contained in the invoked String or not.

Example of Contains() method

In the upcoming code, we have a String object initialized to a value Hello World and we are going to determine if we can a String object this String object starts with a specific String value or not.

//C# Example of the Contains() method of String

using System;

class StringContains
{
public static void Main()
{
	//Creating a String object
	String str1 = "Blue sky looks stunning!";
	
	//Printing the String object
	Console.WriteLine("String is: "  + str1);

	//Calling the Contains() method 
	Console.WriteLine("Does " + str1 + " contains 'sky'? :" + str1.Contains("sky"));

	//Calling the Contains() method
	Console.WriteLine("Does " + str1 + " contains 'look'? :"  + str1.Contains("look"))	;

	//Calling the Contains() Method
	Console.WriteLine("Does " + str1 + " contains 'sunset'? :"  + str1.Contains("sunset"));
	
	//Calling the Contains() Method
	Console.WriteLine("Does " + str1 + " contains 'stun'? :"  + str1.Contains("stun"));
}
}

Output is :

String is: Blue sky looks stunning!
Does Blue sky looks stunning! contains 'sky'? :True
Does Blue sky looks stunning! contains 'look'? :True
Does Blue sky looks stunning! contains 'sunset'? :False
Does Blue sky looks stunning! contains 'stun'? :True

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The Contains() method performs a case-sensitive search

The Contains() method performs a case-sensitive search when searching for a String in the invoked String, let us see how.

//C# The Contains() method of String performs a case-sensitive search

using System;

class StringContains
{
public static void Main()
{
	//Creating a String object
	String str1 = "Blue sky looks stunning!";
	
	//Printing the String object
	Console.WriteLine("String is: "  + str1);

	//Calling the Contains() method 
	Console.WriteLine("Does " + str1 + " contains 'sky'? :" + str1.Contains("sky"));

	//Calling the Contains() method 
	Console.WriteLine("Does " + str1 + " contains 'Sky'? :" + str1.Contains("Sky"));

	//Calling the Contains() method
	Console.WriteLine("Does " + str1 + " contains 'blue sky'? :"  + str1.Contains("blue sky"))	;
	
	//Calling the Contains() Method
	Console.WriteLine("Does " + str1 + " contains 'Stunning'? :"  + str1.Contains("Stunning"));
}
}

Output is :

String is: Blue sky looks stunning!
Does Blue sky looks stunning! contains 'sky'? :True
Does Blue sky looks stunning! contains 'Sky'? :False
Does Blue sky looks stunning! contains 'blue sky'? :False
Does Blue sky looks stunning! contains 'sunset'? :False
Does Blue sky looks stunning! contains 'Stunning'? :False

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