C# | Index of first occurrence in StringCollection
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.
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: