Implementing IDisposable to new class [duplicate]

This question already has an answer here:

• Proper use of the IDisposable interface 15 answers

Feel free to mark this as duplicate but it's a question that's probably basics which I have come across during my interview preparations.

If I write following class.

Public Class Class1{


}

Will any of the following two be any different/beneficial in terms of when/how resource is disposed after it's use

var c=new Class1();   or

using(var c=new Class1())
{

}

If no difference between those, my next questions are reduntant. If second is better, the class1 must implement IDisposable ,

Provided I implement IDisposable

Public Class Class1:IDisposable
{

}

assuming there will be methods properties in the class. what would be correct way to implement.

Dispose method in this class, to make sure all resources are disposed correctly.