asp.net - from the last 2 days my mvc project is throwing this error when i debug it more than twice after restart .. -

asp.net - from the last 2 days my mvc project is throwing this error when i debug it more than twice after restart .. -

i using vs2012 develop mvc 4 project.it used normal before lastly 2 days trowing error when debug more twice after restart ...

a network-related or instance-specific error occurred while establishing connection sql server. server not found or not accessible. verify instance name right , sql server configured allow remote connections. (provider: sql network interfaces, error: 26 - error locating server/instance specified)

i don't have sql server management studio installed on scheme thought probable reason , using sql db created using vs .. can help me out!!! in advance

use sql server 2012 express free download, improve localdb (vs2012)

or

open server explorer tab in vs2012, refresh info connection. localdb locked modul in code.

asp.net sql-server asp.net-mvc database asp.net-mvc-4