Check If a SortedList is Read-Only in C#

To check if a SortedList is read-only, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      SortedList list = new SortedList();
      list.Add("One", "IT");
      list.Add("Two ", "Operations");
      list.Add("Three", "Marketing");
      list.Add("Four", "Purchase");
      list.Add("Five", "Sales");
      list.Add("Six", "Finance");
      Console.WriteLine("SortedList elements...");
      foreach(DictionaryEntry d in list) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("
List of values...SortedList");
      IList col = list.GetValueList();
      foreach(string res in col) {
         Console.WriteLine(res);
      }
      Console.WriteLine("
SortedList is read-only? = "+list.IsReadOnly);
   }
}

Output

This will produce the following output −

SortedList elements...
Five Sales
Four Purchase
One IT
Six Finance
Three Marketing
Two  Operations
List of values...SortedList
Sales
Purchase
IT
Finance
Marketing
Operations
SortedList is read-only? = False

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      SortedList list = new SortedList();
      list.Add("One", "Finance");
      list.Add("Two", "Marketing");
      list.Add("Three", "Sales");
      list.Add("Four", "Purchase");
      list.Add("Five", "Operations");
      list.Add("Six", "IT");
      Console.WriteLine("SortedList elements...");
      foreach(DictionaryEntry d in list) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("
Index at key One = "+list.IndexOfKey("One"));
      ICollection col = list.Keys;
      Console.WriteLine("
Collection of Keys...");
      foreach(string res in col)
         Console.WriteLine(res);
      Console.WriteLine("
SortedList is read-only? = "+list.IsReadOnly);
   }
}

Output

This will produce the following output −

SortedList elements...
Five Operations
Four Purchase
One Finance
Six IT
Three Sales
Two Marketing
Index at key One = 2
Collection of Keys...
Five
Four
One
Six
Three
Two
SortedList is read-only? = False