“/”应用程序中的服务器错误。
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在与 SQL Server 建立连接时出现与网络相关的或特定于实例的错误。未找到或无法访问服务器。请验证实例名称是否正确并且 SQL Server 已配置为允许远程连接。 (provider: SQL 网络接口, error: 26 - 定位指定的服务器/实例时出错)  
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。  

异常详细信息: System.Data.SqlClient.SqlException: 在与 SQL Server 建立连接时出现与网络相关的或特定于实例的错误。未找到或无法访问服务器。请验证实例名称是否正确并且 SQL Server 已配置为允许远程连接。 (provider: SQL 网络接口, error: 26 - 定位指定的服务器/实例时出错)

源错误:  


行 32: //try
行 33: //{
行 34: conn.Open();
行 35: SqlDataAdapter da = new SqlDataAdapter(sql, conn);
行 36: da.Fill(ds);
 

源文件: d:\wwwroot\haiis\demo10\App_Code\SqlHelper.cs 行: 34  

堆栈跟踪:  


[SqlException (0x80131904): 在与 SQL Server 建立连接时出现与网络相关的或特定于实例的错误。未找到或无法访问服务器。请验证实例名称是否正确并且 SQL Server 已配置为允许远程连接。 (provider: SQL 网络接口, error: 26 - 定位指定的服务器/实例时出错)]
  System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +428
  System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65
  System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
  System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65
  System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +96
  System.Data.SqlClient.SqlConnection.Open() +122
  SqlHelper.getData(String sql) in d:\wwwroot\haiis\demo10\App_Code\SqlHelper.cs:34
  rdatadrain.DoDataBind() in d:\wwwroot\haiis\demo10\rdatadrain.aspx.cs:25
  System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
  System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
  System.Data.SqlClient.SqlConnection.Open() +122
  System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
  System.Web.UI.Control.OnLoad(EventArgs e) +99
  System.Web.UI.Control.LoadRecursive() +50
  System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
  SqlHelper.getData(String sql) in d:\wwwroot\haiis\demo10\App_Code\SqlHelper.cs:34
  SqlHelper.getData(String sql) in d:\wwwroot\haiis\demo10\App_Code\SqlHelper.cs:34
  rdataom.DoDataBind() in d:\wwwroot\haiis\demo10\rdataom.aspx.cs:25
  rdatadrain.DoDataBind() in d:\wwwroot\haiis\demo10\rdatadrain.aspx.cs:25
  System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
  rdatadrain.Page_Load(Object sender, EventArgs e) in d:\wwwroot\haiis\demo10\rdatadrain.aspx.cs:18
  System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
  System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
  System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
  System.Web.UI.Control.LoadRecursive() +50
  System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
  System.Web.UI.Control.LoadRecursive() +50
  System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

 


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版本信息: Microsoft .NET Framework 版本:2.0.50727.3634; ASP.NET 版本:2.0.50727.3634  
这是错误提示  

web。config里面是这样的

<connectionStrings><add name="huaian2008ConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename='|DataDirectory|\huaian2009.mdf';Integrated Security=True;User Instance=True"/></connectionStrings>

这个是服务器上面的错误  求大神啊