how can i do different classes in a c # code

Answer 1

Are you want to create multiple classes or Something else.
If you want to create different classes in c# just do it like this.

class One{

}
class Two{

}
class Three{

}
class Final
{
static void Main(string[] args)
{

}
}

Answer 2

How about https://www.sololearn.com/learn/CSharp/2581/