Defenitly it gives Error bcoz we cannot apply operators for 
the type object.

object obj=5 this is boxing

int i=6    this is initialization of variable.

i=i+obj;  here we can't sum the value type and reference 
type.


 so,it gives the error.

//can not applied this because i is value type and obj is 
reference type so this will create error
            //u can do this
            Object obj = 5;
            int i = 6;
            i = i + Convert.ToInt32(obj);

This code works fine

YA it ll work fine

it will give an error...(we hv to typecast object to int)

this definitely work.
since obj as type integer. and also i as integer.
so the output will be 11.

its gives error when obj is type string.