我所遇到的问题，其它程序只要有连接数据库的都会．原先程序都可以用，之后就一直遇到这个问题．是什么原因呢？能不能帮帮我呢？ＱＱ：<a href="mailto:angel0608@126.com" target="_blank">******</a>，谢谢了！<br /> <br /> <br /> <br /> “/Company”应用程序中的服务器错误。 <i>未将对象引用设置到对象的实例。</i> <span><b>说明: </b>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。 <br /> <br /> <b>异常详细信息: </b>System.NullReferenceException: 未将对象引用设置到对象的实例。<br /> <br /> <b>源错误:</b> <br /> <br /> <table class="t_table" style="background:#FFFFCC;width:98%;" cellspacing="1" cellpadding="4"> <tbody> <tr> <td> 行 65： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{行 66： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnStr"]);<span>行 67： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;conn.Open();</span>行 68： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SqlCommand cmd=new SqlCommand("select id,u_qx from c_user where u_name=@name and u_pass=@pass",conn);行 69： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cmd.Parameters.Add("@name",SqlDbType.VarChar); </td> </tr> </tbody> </table> <br /> <b><span>源文件: </span></b>F:\ASP.NET\Company\admin\checked.aspx.cs<b><span>&nbsp;&nbsp;&nbsp;&nbsp;行: </span></b>67 <br /> <br /> <b><span>堆栈跟踪:</span></b> <br /> <br /> <table class="t_table" style="background:#FFFFCC;width:98%;" cellspacing="1" cellpadding="4"> <tbody> <tr> <td> [NullReferenceException: 未将对象引用设置到对象的实例。]&nbsp;&nbsp; LoadLibraryW(UInt16* ) +0&nbsp;&nbsp; System.EnterpriseServices.Thunk.Security.Init() +76&nbsp;&nbsp; System.EnterpriseServices.Thunk.Security.SuspendImpersonation() +81&nbsp;&nbsp; System.EnterpriseServices.Platform.Initialize() +497&nbsp;&nbsp; System.EnterpriseServices.ResourcePool..ctor(TransactionEndDelegate cb) +11&nbsp;&nbsp; System.Data.SqlClient.ConnectionPool..ctor(DefaultPoolControl ctrl) +797&nbsp;&nbsp; System.Data.SqlClient.PoolManager.FindOrCreatePool(DefaultPoolControl ctrl) +170&nbsp;&nbsp; System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean&amp; isInTransaction) +358&nbsp;&nbsp; System.Data.SqlClient.SqlConnection.Open() +384&nbsp;&nbsp; Company.admin._checked.Submit1_ServerClick(Object sender, EventArgs e) in F:\ASP.NET\Company\admin\checked.aspx.cs:67&nbsp;&nbsp; System.Web.UI.HtmlControls.HtmlInputButton.OnServerClick(EventArgs e) +108&nbsp;&nbsp; System.Web.UI.HtmlControls.HtmlInputButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57&nbsp;&nbsp; System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18&nbsp;&nbsp; System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33&nbsp;&nbsp; System.Web.UI.Page.ProcessRequestMain() +1277 </td> </tr> </tbody> </table> <br /> </span>