Ref Type: (a) is store data in heap memory And Accessing Through Refference. (b) Efficent And Fast Accessing Method. (c) Object type,Delegate,Interface,pointer is example that. value type: (a) is store data in stack memory And Accessing through ordinary variable. (b) Scope in Single block And another place duplicate complexity. (c) int,float,double,char etc. Beshak MOHAMED RASOL ALLAH ali