[InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.]
System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +357
System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +311
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +155
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +83
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +190
System.Data.SqlClient.SqlCommand.ExecuteReader() +147
ofertaacademica_interna.Page_Load(Object sender, EventArgs e) in c:\inetpub\www.udlap.mx\ofertaacademica\Default.aspx.cs:378
System.Web.UI.Control.OnLoad(EventArgs e) +86
System.Web.UI.Control.LoadRecursive() +129
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3712
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