Hi Guyz? can you help me, I have a sql server 2012. I created a program using C# Visual Studio connected with a SQL Server Database Express 2012. The program is a search engine which searches data from SQL Server. I published the program and install it to the other computer, the program runs smoothly but when I start searching an error occurred 'Login Failed for user 'USER/GUEST'. (the USER there is my server name so in my idea i think other computer are having troubles with connect to my database)

Can anyone help me? please.
Can anyone guide me? please