A network-related or instance-specific error occurred whereas establishing an association with SQL Server. The server wasn't found or wasn't accessible. Verify that the instance name is correct which SQL Server is organized to permit remote connections. (provider: SQL Network Interfaces, error: twenty-six — Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)

TITLE: Connect to Server
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Cannot connect to \SQLEXPRESS.
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ADDITIONAL INFORMATION:

A network-related or instance-specific error occurred whereas establishing a affiliation to SQL Server.

The server wasn't found or wasn't accessible.

Verify that the instance name is correct which SQL Server is organized to permit remote connections.

(provider: SQL Network Interfaces, error: twenty six - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft SQL Server&EvtSrc=MSSQLServer&EvtID=-1&LinkId=20476
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BUTTONS:
OK
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Solution : Type Start-- Sql Server Configuration Manager run as Admin...(Sql Configuration Manager)
under Sql services -- Start Sql Server