[NullReferenceException: Object reference not set to an instance of an object.]
jbtzj_DAL.tzjadmDAL.updateMusicById(Int32 mid) in D:\MyZone\myfiles\周娟\jbtzj\jbtzj_DAL\tzjadmDAL.cs:305
cqjbtzj.musicdisplay.Page_Load(Object sender, EventArgs e) in E:\project\webapplication\cqjbtzj\cqjbtzj\musicdisplay.aspx.cs:31
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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