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C# | Check if Hashtable has a fixed size

Last Updated : 11 Jul, 2025
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Hashtable.IsFixedSize Property is used to get a value which indicates whether the Hashtable has a fixed size or not. Syntax: 
public virtual bool IsFixedSize { get; }
Return Value: This property returns true if the Hashtable has a fixed size otherwise it returns false. The default is false. Below programs illustrate the above-discussed property: Example 1: CSharp 
// 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);
    }
}
Output: 
False
Example 2: CSharp 
// 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);
    }
}
Output: 
False
Note:
  • 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.
Reference:

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Kirti_Mangal
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