Want to select SQL database using Visual studio c#.net

Yes, you can do that easily. In order to do the same, first, you need to get the list of the database available in your machine. Check the below link in order to see how to get the name of Database in the C#.

https://www.c-sharpcorner.com/blogs/get-list-of-database-name-from-sql-server-in-c-sharp

 

There is already some help available on the below link which also helps you. 

https://stackoverflow.com/questions/13703193/how-to-get-list-of-all-database-from-sql-server-in-a-combobox-using-c-net 

 

Once that is done, you need to create a dynamic connection string from the details selected by the User from the UI. 

 

Hope this will help you.