Refresh external datalinks in excel

Question

The code below doesn't seem to refresh the data links. Does anyone see the issue?

Excel.Application xlApp2 = new Excel.Application();
xlApp2.DisplayAlerts = false;
xlApp2.Visible = true;
Excel.Workbook xlWorkbookt2 = xlApp.Workbooks.Open(@ "\\twg-jks-fs01\twg\Sales\Sales_Volume\Consolidated Sales Volume\Daily Note\Auto DOS Files\Go Live\TWG DOS - FY19 Std Rpts Automated HTML Ready.xlsx", 3, false, missing, missing, missing, true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, missing, true, missing, missing, missing, missing, missing);
Excel._Worksheet xlWorksheet2 = xlWorkbookt2.Sheets[1];

foreach(Microsoft.Office.Interop.Excel.WorkbookConnection conn in xlWorkbookt2.Connections) {
 Console.WriteLine(conn.Name);
}
Excel.Range xlRange2 = xlWorksheet2.UsedRange;
object misValue2 = System.Reflection.Missing.Value;
mWorkSheets = xlWorkbookt2.Worksheets;
string text = File.ReadAllText(@ "\\twg-jks-fs01\twg\PublishedApps\DSN\DBTemplate.txt", Encoding.UTF8);
string buttons = string.Empty;
string frames = string.Empty;

int cntr = 0;
try {
 xlWorkbookt2.RefreshAll();
 System.Threading.Thread.Sleep(60000);

 xlApp2.Application.CalculateUntilAsyncQueriesDone();
 xlWorkbookt2.Save();
} catch (Exception ex) {
 Console.WriteLine("failed Refreshing XLSX Links 2");
}