the list used as a lock is an instance of class ArrayList. According to specification ArrayList implementation, an Arraylist is not synchroized, ie if multiple threads start accessing and or modifying the arraylist the state(data) of arraylist may get corrupted. So the instance "list" is used as lock so that block of code is synchronized and only one thread can access the list at any given point of time. do rate the answer or correct me if i am wrong. thanx Shreyas Rane

well i will have a search on these links. thanks mate : )

hey sorry for late answer : ). nope this is not a business requirement only a little work. so i mean you can not use "!+^%.." characters in name. for exmaple "Pe&%ter".

If you want to be exact, you need them all: days, months and years. The uears because of the leap day in February. The year is a leap year if the year is divisible by four, but not by 100, except if it's divisible by 400. Otherwise you might want to calculate days from the start of the year (takes care of different length months). Just have a table of days in each month and remember to add a day in february if it's a leap year.

Missed a step in removal - sorry You can remove references in the ordered lists, but you can't remove the real record in the natural list Have a bool in the struct that signifies if it's a dead record, don't bother free'ing it until the end of the application - unless you're turning records over dramatically, that will be ok

well mate i know my code is a little bit complicated but its reason is i am just in the beginning level of my project. i will make these operations at the end :). anyway thanks for your suggestions :)

:zzz: Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.