Which properties are obsolete in C#?

If a method has obsolete attributes, the compiler will issue a warning in the code after compilation.

When a new method is used in the class and you still want to keep the old method in the class, you can mark it as obsolete by showing a message that the new method should be used instead of the old method.

The following is an example showing how to use deprecated properties - p>

using System;

public class Demo {
   [Obsolete("Old Method shouldn't be used! Use New Method instead", true)]

   static void OldMethod() {
      Console.WriteLine("This is the old method!");
   }

   static void NewMethod() {
      Console.WriteLine("This is the new method!");
   }

   public static void Main() {
      OldMethod();
   }
}

Since we set the warning message above, the following warning is displayed -

Compilation failed: 1 error(s), 0 warnings
error CS0619: `Demo.OldMethod()' is obsolete: `Old Method shouldn't be used! Use New Method instead'

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