堆栈跟踪:
[NullReferenceException: 未将对象引用设置到对象的实例。]
GOMS.Kizan_Login.Button1_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\GOMS\Kizan_Login.aspx.vb:108
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1263
[NullReferenceException: 未将对象引用设置到对象的实例。]
GOMS.Kizan_Login.Button1_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\GOMS\Kizan_Login.aspx.vb:108
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1263
dr.Close()报错,可能是因为dr为空引用的原因