SQLCommand.EndExecuteNonQueryを使用しているときのSQL構文エラー

Question

バックグラウンドワーカーで2つのSQL文（MSSQL 2005）を非同期で実行しようとしています。しかし、最初のSqlCommandでEndExecuteNonQueryメソッドを呼び出すと、「SQL構文エラーに近い」エラーが表示されます。

try 
{ 
    SqlCommand sqlCmd = uow.DataLayer.CreateCommand() as SqlCommand; 
    sqlCmd.CommandText = "DELETE FROM dbo.EligibilityRecordKeyValue WHERE EligibilityRecord IN " + 
    "(SELECT EligibilityRecord FROM dbo.EligibilityRecord WHERE Organization = '" + map.Organization.Oid + "')"; 
    IAsyncResult result = sqlCmd.BeginExecuteNonQuery(); 
    while (!result.IsCompleted) 
    { 
     worker.ReportProgress(0, "Deleting existing record keys"); 
     System.Threading.Thread.Sleep(200); 
    } 
    count = sqlCmd.EndExecuteNonQuery(result); 
} 
catch (SqlException ex) 
{ 
} 
catch (InvalidOperationException ex) 
{ 
} 
finally 
{ 
    worker.ReportProgress(2, String.Format("Existing {0} records keys deleted.", count)); 
} 

try 
{ 
    SqlCommand sqlCmd = uow.DataLayer.CreateCommand() as SqlCommand; 
    sqlCmd.CommandText = "DELETE FROM dbo.EligibilityRecord WHERE Organization = '" +  map.Organization.Oid + "'"; 
    IAsyncResult result = sqlCmd.BeginExecuteNonQuery(); 
    while (!result.IsCompleted) 
    { 
     worker.ReportProgress(0, "Deleting existing records"); 
     System.Threading.Thread.Sleep(200); 
    } 
    count = sqlCmd.EndExecuteNonQuery(result); 
} 
catch (SqlException ex) 
{ 
} 
catch (InvalidOperationException ex) 
{ 
} 
finally 
{ 
    worker.ReportProgress(5, String.Format("Existing {0} records deleted.", count)); 
} 

それはWAITFOR DELAYの両方のSQLコマンドを実行しても問題が解決したようです追加して、[OK]を最初count = sqlCmd.EndExecuteNonQuery(result);

Answer 1

に失敗：

は、ここに私のコードです。

sqlCmd.CommandText = String.Format("WAITFOR DELAY '00:00:05'; DELETE FROM dbo.EligibilityRecordKeyValue WHERE EligibilityRecord IN " + 
        "(SELECT EligibilityRecord FROM dbo.EligibilityRecord WHERE Organization = '{0}')", map.Organization.Oid); 

sqlCmd.CommandText = String.Format("WAITFOR DELAY '00:00:05'; DELETE FROM dbo.EligibilityRecord WHERE Organization = '{0}'", map.Organization.Oid); 

これはどうして起こるのですか？