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C# | Check if Hashtable has a fixed size

Last Updated : 11 Jul, 2025

is used to get a value which indicates whether the

has a fixed size or not.

public virtual bool IsFixedSize { get; }

This property returns

if the Hashtable has a fixed size otherwise it returns

. The default is

. Below programs illustrate the above-discussed property:

// C# code to check if Hashtable
// has a fixed size
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Hashtable
        Hashtable myTable = new Hashtable();

        // Adding elements in Hashtable
        myTable.Add("G", "Geeks");
        myTable.Add("C", "C#");
        myTable.Add("D", "Data Structures");
        myTable.Add("Q", "Quiz");

        // Checking if Hashtable has a fixed size
        // this will return false
        Console.WriteLine(myTable.IsFixedSize);
    }
}

// C# code to check if Hashtable
// has a fixed size
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Hashtable and 
        // giving it a size of 4
        Hashtable myTable = new Hashtable(4);

        // Adding elements in Hashtable
        myTable.Add("1", "C");
        myTable.Add("2", "C#");
        myTable.Add("3", "DS");
        myTable.Add("4", "Java");
        myTable.Add("5","HTML");
        myTable.Add("6", "CSS");

        // Checking if Hashtable has a fixed size
        // this will return false
        Console.WriteLine(myTable.IsFixedSize);
    }
}

• A collection with a fixed size does not allow the addition or removal of elements after the collection is created, but it allows the modification of existing elements.
• A collection with a fixed size is simply a collection with a wrapper that prevents adding and removing elements. Therefore, if changes are made to the underlying collection, including the addition or removal of elements, the fixed-size collection reflects those changes.
• Retrieving the value of this property is an O(1) operation.

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.hashtable.isfixedsize?view=netframework-4.7.2

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