title: How do I Programmatically change Connection String un LINQ C# Winforms
body: <p>This question may be redundant, but i could not totally understand how to do this.
  I need to be able to, when the users Run my Winforms app, can search for the instance of SQL if the previous one are not available. I already have the check for the DB existence, and also made a dialog wich search for all the available instance, and bulding the connection string isn't a problem. The point here is that, I need to be able to everytime the users open the app it loads the CN from a external file, and if the external file doesn't exist or the instance isn't available, i can use the app in another instance (asuming, offcourse, that the required DB is in that Instance).
  The point is that, i don't know how to Programmatically change Connection String, using LINQ in winforms.
  Thanks in advance</p>