访问被拒绝System.ComponentModel.Win32Exception：拒绝访问[重复]

这个问题在这里已有答案：

• A network-related or instance-specific error occurred while establishing a connection to SQL Server [closed] 1回答

please help me anyone to solve my Erorr when login to my admin account in site....

访问被拒绝说明：在执行当前Web请求期间发生了未处理的异常 . 请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息 .

异常详细信息：System.ComponentModel.Win32Exception：拒绝访问

来源错误：

在执行当前Web请求期间生成了未处理的异常 . 可以使用下面的异常堆栈跟踪来识别有关异常的起源和位置的信息 .

堆栈跟踪：

[Win32Exception（0x80004005）：访问被拒绝]

[SqlException（0x80131904）： Build 与SQL Server的连接时发生与网络相关或特定于实例的错误 . 服务器未找到或无法访问 . 验证实例名称是否正确，以及SQL Server是否配置为允许远程连接 . （提供程序：SQL网络接口，错误：56 - 无法从注册表中指定的位置加载SQLUserInstance.dll . 验证是否已正确安装SQL Server Express的本地数据库运行时功能 . ）] System.Data.SqlClient.SqlInternalConnectionTds ..ctor（DbConnectionPoolIdentity标识，SqlConnectionString connectionOptions，SqlCredential凭证，Object providerInfo，String newPassword，SecureString newSecurePassword，Boolean redirectedUserInstance，SqlConnectionString userConnectionOptions，SessionData reconnectSessionData，DbConnectionPool pool，String accessToken，Boolean applyTransientFaultHandling）830 System.Data.SqlClient.SqlConnectionFactory.CreateConnection （DbConnectionOptions选项，DbConnectionPoolKey poolKey，Object poolGroupProviderInfo，DbConnectionPool池，DbConnection owningConnection，DbConnectionOptions userOptions）329 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（DbConnectionPool池，DbConnection owningObjec t，DbConnectionOptions选项，DbConnectionPoolKey poolKey，DbConnectionOptions userOptions）38 System.Data.ProviderBase.DbConnectionPool.CreateObject（DbConnection owningObject，DbConnectionOptions userOptions，DbConnectionInternal oldConnection）682 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（DbConnection owningObject，DbConnectionOptions userOptions，DbConnectionInternal oldConnection） ）System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，UInt32 waitForMultipleObjectsTimeout，Boolean allowCreate，Boolean onlyOneCheckConnection，DbConnectionOptions userOptions，DbConnectionInternal＆connection）426 System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78 System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource 1 retry，DbConnectionOptions） userOptions，DbConnectionInternal oldConnection，DbConnectionInternal＆connection）191 System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（DbConnection outerConnection，D bConnectionFactory connectionFactory，TaskCompletionSource 1 retry, DbConnectionOptions userOptions) +154 System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry，DbConnectionOptions userOptions）21 System.Data.SqlClient.SqlConnection.TryOpenInner（TaskCompletionSource 1 retry) +90 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource 1 retry）217 System.Data.SqlClient.SqlConnection.Open（）96 System.Data.Linq.SqlClient.SqlConnectionManager . UseConnection（IConnectionUser用户）43 System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe（）41 System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode（）21 System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq . Provider.IProvider.Execute（Expression query）57 System.Data.Linq.Table 1.GetEnumerator() +41 System.Data.Linq.Table 1.System.Collections.Generic.IEnumerable.GetEnumerator（）9 System.Collections.Generic.List 1..ctor(IEnumerable 1 collection）369 System.Linq.Enumerable . ToList（IEnumerable`1 source）58 bicycle.DbClass.GetUserID（String UserName，String PassWord）在c：\ Users \ Emperor.Emperor-PC \ Desktop \ New文件夹（3）\ Bikes \ DbClass1.cs：193 bicycle.Cart .LogInControl.aaddD_Click（Object sender，EventArgs e）位于c：\ Users \ Em中peror.Emperor-PC \ Desktop \ New文件夹（3）\ Bikes \ User \ LogInControl.ascx.cs：20 System.Web.UI.WebControls.Button.OnClick（EventArgs e）9692626 System.Web.UI.WebControls.Button .RaisePostBackEvent（String eventArgument）108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent（String eventArgument）12 System.Web.UI.Page.RaisePostBackEvent（IPostBackEventHandler sourceControl，String eventArgument）15System.Web.UI.Page.RaisePostBackEvent（NameValueCollection postData）35 System.Web.UI.Page.ProcessRequestMain（Boolean includeStagesBeforeAsyncPoint，Boolean includeStagesAfterAsyncPoint）3562