NUMBER RANDOM GENERATOR

.net Hi developer, we need a program to be installed on any windows computer This program is a RANDOM generator of numbers which include those demands: 1. It will ask one or different prefixes (for example 661 or 662 or 663 or the 3 of them) 2. It will ask the count after prefixes (6, 7 or 8 digits) 3. It will ask the total that should be generated on one list, for example 20000, 30000, 256000 or one millions, 2 million etc … 4. It will ask if we need a UNIQUE PREFIX in the second column (see below) 5. It will ask how many lists needed and what the name should the list have (example the name is “sample”, so the program will create sample1, sample2 etc …) 6. It will generate the list in the format Microsoft Excel, XLS (it has to be compatible with last office version) 7. The list will be generated RANDOMLY in the first column in the CHOSSEN FOLDER (!) 8. It will have to generate lists using one single prefix or different prefixes by mixing randomly the numbers on the columns. PS indeed each list of this folder has to be UNIQUE so whatever the number of list the program should look in the target folder to see if any number was not already generated (if this is the case it won’t create any duplicate in the list AND in the folder..) This option is very important so any other idea to make it works is welcome! This program has to be fast and has to work in any past generation of computer (for example Pentium 4 or whatever) SO, light, fast, performing and intelligent It has to be send to us as exclusivity and not sold or send for free over the internet Please see folder attached with: A list which starts with prefixes “6” (see the previous point 1) A list with have 8 numbers after the prefixes (see the previous point 2) A list with 30 numbers of numbers (see the previous point 3), 30 as it is an example it is usually 50000 or MANY MORE .. A list with a UNIQUE PREFIX “33” in the second column ( but it is only an option if we type “none” on the program it would create this “second column” A list in XLS And at last a totally RANDOM list The next list will NEVER use the same number if the target folder is the same as the previous list (THIS IS VERY IMPORTANT) Thanks in advance, we are waiting for the BEST and FAST DEVELLOPER