what is the difference between the Implicit and Explicit Calling?

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C#

C#4.0

Hi all,

Can any one tell me what is the difference between the explicit and implicit calling of a method?
Like when we put cursor and press ِAlt+Shift+F10 on the Interface we will be able to see the two options.See this example

class TestInterface : IFirst, ISecond
   {
       static void Main(string[] args)
       {

       }
   }