如何将sql server express数据库连接到VS 2017

I keep running into issues just trying to make a connection from my c# program in Visual Studio 2017 Express to a small local database with one table I created in Sql Server Express. I would like to connect it as a data source within Entity Framework in my solution (which is in c#). I've searched MSDN and this site for days but haven't found a way to solve this.I keep running into issues just trying to make