How do I check For any reason (Stop the database instance) Do not connect to the database

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ASP.NET

LINQ

hi when connect to sql in page cs with entity to linq

using(Hrst temp=new Hrst())
              {
                  var t = temp.F_News_show_User();
                  if (t != null)
                  {
                      Repeater1.DataSource = t;
                      Repeater1.DataBind();
                  }
                  else
                  {
                      LMsg.Visible = true;
                      LMsg.Text = "asdas";
                  }

              }

i need check For any reason (Stop the database instance) Do not connect to the database
this error and show Appropriate message.
this error when stop sqlserver

The system cannot find the file specified
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)