A simple express transportation management system source code, developed using a multi-layer model, has the following functions: Bill management: bill distribution, bill inquiry, bill cancellation Receiving management: fill in the freight bill and query the freight bill Vehicle distribution management: fill in the transportation contract and query the transportation contract Arrival management: driver’s receipt, customer’s receipt, new arrivals Transfer management: The company fills in the company inquiry. The transfer fills in the transfer inquiry. Customer Service: Customer Complaints Complaint Handling Complaint History Application management: Customers fill in customer query city information route information User management DB_51aspx is a Sql2005 database, and the default account/password is: 51aspx/51aspx