If you are still on the connection string of various databases in .NET, then this website will be your must-see! http://www.connectionstrings.com/
Of course, there is a simple man: You create a .txt file in any position, rename it to xxxx.udl, double-click it, OK, follow the connection wizard to open the UDL file, then you look It is the connection string. However, the connection string generated by this method may not be connected in the ADO.NET code, then you only need to delete some of the unnecessary parts thereof.
