未与信任 SQL Server 连接相关联。 - 编程论坛

“/WebSite1”应用程序中的服务器错误。
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用户 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。
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 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。

源错误:

行 47:     {
行 48:         SqlConnection con = this.getcon();
行 49:         con.Open();
行 50:         SqlDataAdapter mydataadapter = new SqlDataAdapter(sqlstr3, con);
行 51:         DataSet mydataset = new DataSet();

源文件: c:\Inetpub\wwwroot\WebSite1\App_Code\Datacon.cs    行: 49

堆栈跟踪:

[SqlException (0x80131904): 用户 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734947
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
   System.Data.SqlClient.(Boolean enlistOK) +33
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
   System.Data.SqlClient.SqlConnection.Open() +111
   Datacon.ecDropDownList(DropDownList DDL, String sqlstr3, String DTF, String DVF) in c:\Inetpub\wwwroot\WebSite1\App_Code\Datacon.cs:49
   zhuce.Page_Load(Object sender, EventArgs e) in c:\Inetpub\wwwroot\WebSite1\zhuce.aspx.cs:18
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +45
   System.Web.UI.Control.OnLoad(EventArgs e) +98
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4308

请大家帮忙下,我现在急需要高手的指点!!!