If a class is IMPLEMENTING the inherited interface member by prefixing the name of the interface, then the class is "Explicitly Implemeting an Interface member". The disadvantage of Explicitly Implemeting an Interface member is that, the class object has to be type casted to the interface type to invoke the interface member. An EXAMPLE is SHOWN below.

using System;
namespace Interfaces
{
interface Car
{
VOID Drive();
}
class Demo : Car
{
// Explicit implementation of an interface member
void Car.Drive()
{
Console.WriteLine("Drive Car");
}
static void Main()
{
Demo DemoObject = new Demo();
//DemoObject.Drive();
// Error: Cannot call explicitly implemented interface method
// using the class object.
// Type CAST the demo object to interface type Car
((Car)DemoObject).Drive();
}
}
}

If a class is implementing the inherited interface member by prefixing the name of the interface, then the class is "Explicitly Implemeting an Interface member". The disadvantage of Explicitly Implemeting an Interface member is that, the class object has to be type casted to the interface type to invoke the interface member. An example is shown below.

using System;
namespace Interfaces
{
interface Car
{
void Drive();
}
class Demo : Car
{
// Explicit implementation of an interface member
void Car.Drive()
{
Console.WriteLine("Drive Car");
}
static void Main()
{
Demo DemoObject = new Demo();
//DemoObject.Drive();
// Error: Cannot call explicitly implemented interface method
// using the class object.
// Type cast the demo object to interface type Car
((Car)DemoObject).Drive();
}
}
}