Single Inheritance C#

Single Inheritance C#

class A
{
public void printHello()
{
Console.WriteLine("Hello");
}
}
class B : A
{
public void printHi()
{
Console.WriteLine("Hi");
}
}
class Program
{
static void Main(string[] args)
{
B objB = new B();
objB.printHi();
objB.printHello();
// 'B' does not contain a definition for 'printHello'
Console.ReadKey();
}
}