Answer Posted / dharmendra nonia

A reference parameter contain only reference of variable
instead of value. In reference type parameter if changes
occurs in variable than it affect the original value. But
in out parameter it send only a copy of variable instead of
reference therefore if u change in variable no changes
occur in original value.
For example:-
class Program
{
public void refparameter(ref int a)
{
a += 5;
}
public void outparameter(out int p)
{
p = 20;
}
static void Main(string[] args)
{
Program p = new Program();
int b,c;
Console.Write("Enter a Number:");
b = Int32.Parse(Console.ReadLine());
p.refparameter(ref b);
//After the calling of refparameter it change the value of b
Console.WriteLine("After calling refparameter
method value of B is:{0}",b);
p.outparameter(out c);
Console.WriteLine("After calling the
outparameter method value of C is:{0}",c);
Console.ReadLine();
}
}

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