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⇱ Stack.Contains() Method in C# - GeeksforGeeks


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Stack.Contains() Method in C#

Last Updated : 11 Jul, 2025
This method(comes under System.Collections namespace) is used to check whether a specified element is present is Stack or not. Internally this method checks for equality by calling the Object.Equals method. Also, it performs a linear search, therefore, this method is an O(n) operation, where n is Count. Syntax:
public virtual bool Contains (object obj);
Here, obj is the object to locate in the Stack. The value can be null. Return Value: It returns true, if obj is found in the Stack otherwise returns false. Below programs illustrate the use of above-discussed method: Example 1:
Output:
True
Example 2:
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