Page Error

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The error occurred in: http://biotechconnections.org/default.aspx?IdTrang=Home&idCatolo=1- Business Equipment and Copiers
Error Message: There is already an open DataReader associated with this Command which must be closed first.

Stack Trace:
System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first. at DataAccess.menu_right.cmd_menuright_tren.GetAllQuangcaoMenuRigh1t(String namecoto) in C:\Inetpub\wwwroot\Solution_BIOTECH\DataAccess\menu_right\cmd_menuright_tren.cs:line 171 at Project_BIOTECH_C.Uc_Control_Template.uc_menu_right_tren.getQuangcao1(String m_a) at Project_BIOTECH_C.Uc_Control_Template.uc_menu_right_tren.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)