Use F10 Key to go line by line starting from the break point you have set.. and use F11 key (Step Into Command) If you are currently in break mode on a line of code that contains a method call, the Step Into command will enter the method and break again on the first line of code inside the method.. refer to the following link below for more informations
http://www.odetocode.com/Articles/425.aspx
http://msdn.microsoft.com/en-us/library/sc65sadd.aspx