오류:System.InvalidOperationException: ExecuteReader을(를) 사용하려면 Connection이 열려 있고 사용 가능해야 합니다. 현재 연결은 닫힌 상태입니다. 위치: System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) 위치: 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) 위치: System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) 위치: System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) 위치: System.Data.SqlClient.SqlCommand.ExecuteReader() 위치: webJungMin.jmmMain.jmmSiteList.DisplaySiteList(String sMallKindS, Int32& iSiteCnt, String sKeyword) 파일 D:\MyCVS\webJungMin\webJungMin\jmmMain\jmmSiteList.aspx.cs:줄 83