DataSource Controls :: Cannot Connect To SAEID-PCSQLEXPRESS?

Sep 8, 2010

I have use vs.net 2008 and sql erver 2008.When I wanna connect to sqlExpress in Sql Server Managment Studio 2008 this error is shown:Cannot connect to SAEID-PCSQLEXPRESS.A network-related or instance-specificerror occurred while establishing a connectionto SQL Server. The server was not found or was notaccessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error LocatingServer/Instance Specified) (.Net SqlClient Data Provider)
In SqlServer Configuration Manager when I want start SqlExpress service an error is shown to me that cann't start the service.

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my site is working and running wrote in c# and mssql 2005,

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