如何解决SQL连接字符串问题？

I'm experienced with both VB.NET and SQL, but I've never worked with both at the same time before. I've found dozens of online tutorials, most of which contradict each other and none of which I can get to work. I now have a sizable project on the brink of completion except for the SQL functionality and I'm at my wits end trying to solve it.I'm experienced with both VB.NET and SQL, but I