C# | Insert at the specified index 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.Insert(Int32, String) method is used to insert a string into the StringCollection at the specified index.

Syntax:

public void Insert (int index, string value);

Parameters:

index: The zero-based index at which value is inserted.
value: The string to insert. The value can be null.

Exception: This method will give ArgumentOutOfRangeException if the index is less than zero Or index is greater than Count.

Note:

Duplicate strings are allowed in StringCollection.
If index is equal to Count, value is added to the end of StringCollection.
This method is an O(n) operation, where n is Count.

Below programs illustrate the use of StringCollection.Insert(Int32, String) Method:

Example 1:

// C# code to insert a string into 
// the StringCollection at the 
// specified index 

using System; 

using System.Collections; 

using System.Collections.Specialized; 

class GFG { 

    // Driver code 

    public static void Main() 

    { 

        // creating a StringCollection named myCol 

        StringCollection myCol = new StringCollection(); 

        // Inserting elements into the string  

        // at specified indexes 

        myCol.Insert(0, "A"); 

        myCol.Insert(1, "B"); 

        myCol.Insert(2, "F"); 

        myCol.Insert(3, "L"); 

        myCol.Insert(4, "Y"); 

        myCol.Insert(5, "Z"); 

        // Displaying the elements in StringCollection 

        foreach(Object obj in myCol) 

        { 

            Console.WriteLine(obj); 

        } 

    } 
}

Output:

A
B
F
L
Y
Z

Example 2:

// C# code to insert a string into 
// the StringCollection at the 
// specified index 

using System; 

using System.Collections; 

using System.Collections.Specialized; 

class GFG { 

    // Driver code 

    public static void Main() 

    { 

        // creating a StringCollection named myCol 

        StringCollection myCol = new StringCollection(); 

        // Inserting elements into the string 

        // at specified indexes 

        myCol.Insert(0, "2"); 

        myCol.Insert(1, "4"); 

        // This should raise exception 

        // "ArgumentOutOfRangeException" as 

        // index is less than 0 

        myCol.Insert(-3, "6"); 

        myCol.Insert(3, "8"); 

        myCol.Insert(4, "10"); 

        myCol.Insert(5, "12"); 

        // Displaying the elements in StringCollection 

        foreach(Object obj in myCol) 

        { 

            Console.WriteLine(obj); 

        } 

    } 
}

Output:

Unhandled Exception:
System.ArgumentOutOfRangeException: Insertion index was out of range. Must be non-negative and less than or equal to size.
Parameter name: index

Reference: