class and variable

class:

1.      class is a user defined data type   (or)
2.  class is a virtual entity    (or)
3. It is a model or template or blue print

    syntax:
      public class <classname> // class name is user defiend

     {
 
      }

example:

      public partial class _Default:System.Web.UI.Page
       {

          protected void Page_Load(Object sender,EventArgs e)
           {

                        //Main method for the Program       
          }
   } 
   public class Doctor
    {
       public string name="dr.ramesh";
       public string address="bangalore";
}
 variable:

Def:We have to declare a variable when we want to store a data in our program 

 Variables divided into 2 types
1.Local variables
2.Global variables or Class level variables or Fields.
Note:Class level variables are the variables which are directly declared within the scope of the class.

Sample code:

public class Engineer
 {
 
   public int age=36;          //Here age is a global variables
 
   public string name="Dr.Suresh"; //Here name is a global variables      
 
   public int M(int x,string y)
 
     {
       int x1=10;   //Parameter x and y are local variables
       string y1="Hello";
       return x1;  //x1 and y1 declared within M method are local variables
 
      }
 
}