the ticket selling app is written in xamarin and is crossed platform form Android, IOS, Windows Registration: users will register using their phone number. user insert the phone number in a textbox. the user will receive a confirmation text message. The confirmation textmessage will contain a verification code. the user will then enter the code in the verification box. concert promoters: promoters will signup to be a promoter, admin will need to validate the promotes account before promoters can get access account. Promoters can give other promoters access to manage their events. events: promoter can create events. give description, location, and duration. Promoter can also limit sell to a number of tickets. For example, if the promoter wants to sell 100 tickets. The promoter can set a number of tickets for sale. if the ticket number is limited, there will be a ticket counter to count left over tickets. promoter can check in people at the event by scanning their tickets or enter the ticket number. buying tickets: user will access and purchase tickets. user can purchase more than 1 tickets. for the ticket purchase, user will obtain a ticket number. and the number or a barcode van be used to check in the event.