How To Iterate Dictionary Object
 Dictionary is a object that can store values in Key-Value pair. its just like a list, the only difference is:  List can be iterate using index(0-n)  but not the Dictionary .   Generally when we try to iterate the dictionary we get below error:   " Collection was modified; enumeration operation may not execute. "  So How to parse a dictionary and modify its values??  To iterate dictionary we must loop through it's keys  or key - value  pair.   Using keys