Link SQL database in Visual Studio 2012

1^st step: Open Server Explorer by Pressing Ctrl+Alt+S and Click on Add Connection

2^nd step: Click on Change Data Source in Add Connection Window

3^rd step: change Microsoft SQL Server Database File to Microsoft SQL Server and Press OK

4^th step: Select the Server Name by clicking on icon of drop down menu

5^th step: select the database name by clicking on icon of drop down menu

6^th step: Click on Test Connection Button

7^th step: Test Connection Succeeded and Press OK

8^th step: Press OK in Add Connection window

Finally, Database Connection is visible now Server Explorer