[InvalidOperationException: Invalid attempt to call Read when reader is closed.]
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +890
System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue) +50
System.Data.SqlClient.SqlCommand.ExecuteScalar() +208
util.findMusicScoreFilesCount(String MusicScoreID) in E:\AADATA\WEB\NT\App_Code\util.vb:280
ASP.playmaterial_aspx.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in E:\AADATA\WEB\NT\playMaterial.aspx:801
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +115
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +253
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.Page.Render(HtmlTextWriter writer) +38
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4240
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