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C# | SortedDictionary.Remove() Method - GeeksforGeeks

C# | SortedDictionary.Remove() Method

Last Updated : 11 Jul, 2025

This method is used to remove the value with the specified key from the

SortedDictionary<TKey, TValue>

.

Syntax: 
public bool Remove (TKey key);
Return Value:

This method returns

true

if the element is successfully found and removed; otherwise it returns

false

. This method returns

false

if key is not found in the SortedDictionary.

Exception:

This method will give

ArgumentNullException

if the

key

is null. Below are the programs to illustrate the use of the above-discussed method:

Example 1: csharp 
// C# code to remove the entry with
// the specified key from the
// SortedDictionary
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Create a new dictionary of
        // strings, with string keys.
        SortedDictionary<string, string> myDict = 
          new SortedDictionary<string, string>();

        // Adding key/value pairs in myDict
        myDict.Add("Australia", "Canberra");
        myDict.Add("Belgium", "Brussels");
        myDict.Add("Netherlands", "Amsterdam");
        myDict.Add("China", "Beijing");
        myDict.Add("Russia", "Moscow");
        myDict.Add("India", "New Delhi");

        // To get count of key/value pairs in myDict
        Console.WriteLine("Total key/value pairs"
            + " in myDict are : " + myDict.Count);

        // Remove the entry with the specified
        // key from the Dictionary
        myDict.Remove("Russia");

        Console.WriteLine("After remove operation");

        // To get count of key/value pairs in myDict
        Console.WriteLine("Total key/value pairs"
           + " in myDict are : " + myDict.Count);
    }
}
Output: 
Total key/value pairs in myDict are : 6
After remove operation
Total key/value pairs in myDict are : 5
Example 2: csharp 
// C# code to remove the entry with
// the specified key from the
// SortedDictionary
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Create a new SortedDictionary
        // of ints, with int keys.
        SortedDictionary<int, int> myDict = 
          new SortedDictionary<int, int>();

        // Adding key/value pairs in myDict
        myDict.Add(9, 8);
        myDict.Add(3, 4);
        myDict.Add(4, 7);
        myDict.Add(1, 7);

        // To get count of key/value pairs in myDict
        Console.WriteLine("Total key/value pairs "
             + "in myDict are : " + myDict.Count);

        // Remove the entry with the specified
        // key from the Dictionary
        myDict.Remove(9);

        Console.WriteLine("After remove operation");

        // To get count of key/value pairs in myDict
        Console.WriteLine("Total key/value pairs in"
                 + " myDict are : " + myDict.Count);
    }
}
Output: 
Total key/value pairs in myDict are : 4
After remove operation
Total key/value pairs in myDict are : 3
Reference:

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