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Showing content from https://www.geeksforgeeks.org/c-sharp/c-sharp-insert-at-the-specified-index-in-stringcollection/ below:

C# | Insert at the specified index in StringCollection

Last Updated : 11 Jul, 2025

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

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: CSHARP


 // 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);
        }
    }
}

Example 2: CSHARP


 // 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:

https://learn.microsoft.com/en-us/dotnet/api/system.collections.specialized.stringcollection.insert?view=netframework-4.7.2

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