How to create a StringDictionary in C#

Last Updated : 11 Jul, 2025
StringDictionary() constructor is used to initialize a new instance of the StringDictionary class which will be empty and will have the default initial capacity. StringDictionary is a specialized collection. This class comes under the System.Collections.Specialized namespace. It only allows string keys and string values. It suffers from performance problems. It implements a hash table with the key and the value strongly typed to be strings rather than objects. Syntax: 
public StringDictionary ();
Example 1: csharp 
// C# Program to illustrate how
// to create a StringDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // sd is the StringDictionary object
        // StringDictionary() is the constructor
        // used to initializes a new
        // instance of the StringDictionary class
        StringDictionary sd = new StringDictionary();

        // Count property is used to get the
        // number of elements in StringDictionary
        // It will give 0 as no elements
        // are present currently
        Console.WriteLine(sd.Count);
    }
}
Output: 
0
Example 2: csharp 
// C# Program to illustrate how
// to create a StringDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // sd is the StringDictionary object
        // StringDictionary() is the constructor
        // used to initializes a new
        // instance of the StringDictionary class
        StringDictionary sd = new StringDictionary();

        Console.Write("Before Add Method: ");

        // Count property is used to get the
        // number of elements in StringDictionary
        // It will give 0 as no elements
        // are present currently
        Console.WriteLine(sd.Count);

        // Adding key/value pairs in sd
        sd.Add("1", "C");
        sd.Add("2", "C++");
        sd.Add("3", "Java");
        sd.Add("4", "Python");
        sd.Add("5", "C#");
        sd.Add("6", "HTML");

        Console.Write("After Add Method: ");

        // Count property is used to get the
        // number of elements in sd
        Console.WriteLine(sd.Count);
    }
}
Output: 
Before Add Method: 0
After Add Method: 6
Reference:
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