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Test if someObject is, or is derived from, a TextReader using the is operator

using System; using System.IO; class MainClass {     public static void Main()      {         Object someObject = new StringReader("This is a StringReader");                  if (someObject is TextReader)          {             Console.WriteLine(                 "is: someObject is a TextReader or a derived class");         }     } } is: someObject is a TextReader or a derived class