// Implicit Casting
int x = 5
long y = x;    // implicitly converted, no data is lost
Derived d = new Derived(); 
Base b = d;   // Always OK.

// Explicit Casting
double  x = 1234.56;
int y = (int) x ;    // y = 1234,  data lost by explicitly casting
Animal x = new Animal(); 
Cat y = (Cat) x;

// To avoid exception: use `is` & `as` operator
if (myObject is Foo)
{
    // casting
}
var x = "Hassan";
var y = x as object;

// Convert Class
var intString = "123"
var intVal = Convert.ToInt32(intString);

// TryParse
var intAsString = "10";
Int32.TryParse(intAsString, out intVal);