System.InvalidOperationException: A Command è già associato un DataReader aperto, che deve essere chiuso. in System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) in System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command) in System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) in 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) in System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) in System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) in System.Data.SqlClient.SqlCommand.ExecuteReader() in SitoVeniceHolidays_0316.uc_ddl_nazioni.ShowDdlNazioni()