System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.
   at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at DataBase.Open() in c:\inetpub\vhosts\nmpx.cn\httpdocs\App_Code\database.cs:line 44
   at DataBase.getDataTable(String sql) in c:\inetpub\vhosts\nmpx.cn\httpdocs\App_Code\database.cs:line 142
   at DataBase.getDataTable(String sql) in c:\inetpub\vhosts\nmpx.cn\httpdocs\App_Code\database.cs:line 142<br />