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Server Error in '/' Application.

There is already an open DataReader associated with this Command which must be closed first.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first. Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.] System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +1733386 System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +314 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) +156 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +84 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +207 System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +214 System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +465 System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +147 DA_process.selectByQueryString(String query) in D:\Projects\Tascom\dienthanhan.com\Cms\Controller\DA_process.cs:34 Pages_Product_ProductDetail.loaddetail(Int32 id) in D:\Projects\Tascom\dienthanhan.com\Cms\Pages\Product\ProductDetail.aspx.cs:96 Pages_Product_ProductDetail.Page_Load(Object sender, EventArgs e) in D:\Projects\Tascom\dienthanhan.com\Cms\Pages\Product\ProductDetail.aspx.cs:52 System.Web.UI.Control.OnLoad(EventArgs e) +108 System.Web.UI.Control.LoadRecursive() +90 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4797.0

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