A network-related or instance-specific error occurred while establishing a connection to SQL Server. 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: TCP Provider, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。)
Server Error in '/' Application.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. 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: TCP Provider, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. 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: TCP Provider, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。)
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[SqlException (0x): A network-related or instance-specific error occurred while establishing a connection to SQL Server. 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: TCP Provider, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。)]
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +700
System.Web.UI.Control.LoadRecursive() +71
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +89
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +6352494
System.Data.SqlClient.SqlConnection.Open() +300
System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection(IConnectionUser user) +61
System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe() +38
System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode() +30
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +81
System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression expression) +50
System.Linq.Queryable.FirstOrDefault(IQueryable`1 source, Expression`1 predicate) +590
mmb.web.cuxiao.discuxiao0531.Page_Load(Object sender, EventArgs e) +17216
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.UI.Control.LoadRecursive() +71
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064
Version Information:&Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.}