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C# | Index of first occurrence in StringCollection

Last Updated : 11 Jul, 2025
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StringCollection class is a new addition to the .NET Framework class library that represents a collection of strings. StringCollection class is defined in the System.Collections.Specialized namespace. StringCollection.IndexOf(String) method is used to search the specified string which returns the zero-based index of the first occurrence within the StringCollection. Syntax:
public int IndexOf (string value);
Here, value is the string to locate. The value can be null. Return Value: The method returns zero-based index of the first occurrence of value in the StringCollection, if found otherwise it returns -1. Note: This method performs a linear search. Therefore, this method is an O(n) operation, where n is Count. Below programs illustrate the use of StringCollection.IndexOf(String) method: Example 1:
Output:
2
Example 2:
Output:
-1
Reference:

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