最近在做ASP.NET实训。常识在ADO.NET连接数据库，但是连不上，代码如下：
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection lin = new SqlConnection();
lin.ConnectionString = "Data Source=SLEEPYBEAR-PC;Integrated Security=SSPI;Initial Catalog=Library";
lin.Open();//报错语句
Label1.Text="连接成功";
lin.Close();
lin.Dispose();
｝
数据库命，服务器命都没错，但是连接时就出现：
“/WebSite1”应用程序中的服务器错误。
--------------------------------------------------------------------------------
用户 'SleepyBear-PC\SleepyBear' 登录失败。
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: 用户 'SleepyBear-PC\SleepyBear' 登录失败。
源错误:
行 17: SqlConnection lin = new SqlConnection();
行 18: lin.ConnectionString = "Data Source=SLEEPYBEAR-PC;Integrated Security=SSPI;Initial Catalog=Library";
行 19: lin.Open();
行 20: Label1.Text="连接成功";
行 21: lin.Close();
源文件: d:\VS Project\WebSites\WebSite1\Default.aspx.cs 行: 19
堆栈跟踪:
[SqlException (0x80131904): 用户 'SleepyBear-PC\SleepyBear' 登录失败。]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4856551
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1121
System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) +35
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +144
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +340
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +225
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +189
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +185
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +31
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +431
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +499
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
System.Data.SqlClient.SqlConnection.Open() +122
_Default.Button1_Click(Object sender, EventArgs e) in d:\VS Project\WebSites\WebSite1\Default.aspx.cs:19
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10