[Exception: System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.
at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
at 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)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillSchemaInternal(DataSet dataset, DataTable datatable, SchemaType schemaType, IDbCommand command, String srcTable, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillSchema(DataTable dataTable, SchemaType schemaType, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillSchema(DataTable dataTable, SchemaType schemaType)
at XL_BANG.Doc_bang() in d:\inetpub\vhosts\spchcmc.vn\httpdocs\App_Code\LopXuLyLuuTru\XL_BANG.cs:line 73]
XL_BANG.Doc_bang() in d:\inetpub\vhosts\spchcmc.vn\httpdocs\App_Code\LopXuLyLuuTru\XL_BANG.cs:81
XL_BANG..ctor(String pTen_bang, String pChuoi_SQL) in d:\inetpub\vhosts\spchcmc.vn\httpdocs\App_Code\LopXuLyLuuTru\XL_BANG.cs:54
BANG_tbl_Param..ctor(String pChuoi_SQL) in d:\inetpub\vhosts\spchcmc.vn\httpdocs\App_Code\LopXuLyNghiepVu\BANG_tbl_Param.cs:16
EN_GioiThieu.LoadData() in d:\inetpub\vhosts\spchcmc.vn\httpdocs\EN\GioiThieu.aspx.cs:21
EN_GioiThieu.Page_Load(Object sender, EventArgs e) in d:\inetpub\vhosts\spchcmc.vn\httpdocs\EN\GioiThieu.aspx.cs:14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +95
System.Web.UI.Control.LoadRecursive() +59
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
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