[SqlException（0x80131904）：无法打开登录请求的数据库“aspnetdb”。登录失败。用户'IIS APPPOOL \ default'登录失败。] System.Data.SqlClient.SqlInternalConnection.OnError（SqlException异常，Boolean breakConnection，Action'1 wrapCloseInAction）+6676046 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning（TdsParserStateObject stateObj，Boolean callerHasConnectionLock ，Boolean asyncClose）+810 System.Data.SqlClient.TdsParser.TryRun（RunBehavior runBehavior，SqlCommand cmdHandler，SqlDataReader dataStream，BulkCopySimpleResultSet bulkCopyHandler，TdsParserStateObject stateObj，Boolean＆amp; dataReady）+4403 System.Data.SqlClient.TdsParser.Run（RunBehavior runBehavior， SqlCommand cmdHandler，SqlDataReader dataStream，BulkCopySimpleResultSet bulkCopyHandler，TdsParserStateObject stateObj）+84 System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin（Boolean enlistOK）+55 System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin（ServerInfo serverInfo，String newPassword，SecureString newSecurePassword，Boolean ignoreSniOpenTimeout ，TimeoutTimer timeo ut，Boolean withFailover）+368 System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover（ServerInfo serverInfo，String newPassword，SecureString newSecurePassword，Boolean redirectedUserInstance，SqlConnectionString connectionOptions，SqlCredential credential，TimeoutTimer timeout）+6704814 System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist（ TimeoutTimer timeout，SqlConnectionString connectionOptions，SqlCredential credential，String newPassword，SecureString newSecurePassword，Boolean redirectedUserInstance）+6705315 System.Data.SqlClient.SqlInternalConnectionTds..ctor（DbConnectionPoolIdentity identity，SqlConnectionString connectionOptions，SqlCredential credential，Object providerInfo，String newPassword，SecureString newSecurePassword，Boolean redirectedUserInstance，SqlConnectionString userConnectionOptions）+610 System.Data.SqlClient.SqlConnectionFactory.CreateConnection（DbConnectionOptions选项，DbConnectionPoolKey poolKey，Object poolGroupProviderInfo，DbConn ectionPool pool，DbConnection owningConnection，DbConnectionOptions userOptions）+1049 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（DbConnectionPool pool，DbConnectionOptions options，DbConnectionPoolKey poolKey，DbConnectionOptions userOptions）+74 System.Data.ProviderBase.DbConnectionPool.CreateObject（DbConnectionOptions userOptions）+6707883 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（DbConnectionOptions userOptions）+78 System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，UInt32 waitForMultipleObjectsTimeout，Boolean allowCreate，Boolean onlyOneCheckConnection，DbConnectionOptions userOptions，DbConnectionInternal＆amp;连接）+2192 System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，TaskCompletionSource'1 retry，DbConnectionOptions userOptions，DbConnectionInternal＆amp; connection）+116 System.Data.ProviderBase.DbConnectionFactory.TryGetConnection（DbConnection owningConnection，TaskCompletionSource'1 retry，DbConnectionOptions userOptions，DbConnectionInternal＆amp; connection）+1012 System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection（DbConnection outerConnection，DbConnectionFactory connectionFactory，TaskCompletionSource'1 retry，DbConnectionOptions userOptions）+6712511 System.Data.SqlClient.SqlConnection.TryOpen（TaskCompletionSource'1 retry）+ 152 System.Data.SqlClient.SqlConnection.Open（）+229 System.Web.DataAccess.SqlConnectionHolder.Open（HttpContext context，Boolean revertImpersonate）+150 System.Web.DataAccess.SqlConnectionHelper.GetConnection（String connectionString，Boolean revertImpersonation）+4876314 System.Web.Security.SqlRoleProvider.GetUs ersInRole（String roleName）+1440 System.Web.Security.Roles.GetUsersInRole（String roleName）+335 mykladr.SiteMaster.Page_Init（Object sender，EventArgs e）+499 System.Web.UI.Control.InitRecursive（Control namingContainer）+ 186 System.Web.UI.Control.InitRecursive（Control namingContainer）+421 System.Web.UI.Page.ProcessRequestMain（Boolean includeStagesBeforeAsyncPoint，Boolean includeStagesAfterAsyncPoint）+2098
我在web.config中的连接字符串是：
<add name="aspnetdbConnectionString" connectionString="Data Source=kit-pc\;Initial Catalog=aspnetdb;Integrated Security=True"
providerName="System.Data.SqlClient" />
我对这个问题感到困惑，但是我看到了一些话题，我找不到答案。