Retrieve TimeSheets of all users

I have created a simple console C# application that retrieves TimeSheets of the admin user used in the Sharepoint athentification, but what i want to do is to retrieve all users TimeSheets for a certain period (TimeSheetPeriods), any ideas about how you can do this? any sample code?

here is my code may be i forgot something :

cntx.Load(cntx.Projects);
cntx.ExecuteQuery();
cntx.Load(cntx.TimeSheetPeriods, c => c.Where(p => p.Start <= DateTime.Now && p.End <= DateTime.Now).
IncludeWithDefaultProperties(p => p.TimeSheet,
p => p.TimeSheet.Lines.Where(l => l.LineClass == TimeSheetLineClass.StandardLine).
IncludeWithDefaultProperties(l => l.Assignment,
l => l.Assignment.Task,
l => l.Work)));
cntx.ExecuteQuery();
var myPeriod = cntx.TimeSheetPeriods.LastOrDefault();
if (myPeriod == null)
throw new Exception("Please create the periods in your server settings");
foreach (var line in myPeriod.TimeSheet.Lines)
{
Console.WriteLine("ProjectName : "+line.ProjectName);
Console.WriteLine("TaskName : " + line.TaskName);
foreach (var work in line.Work)
{
Console.WriteLine("PlannedWork----->" + work.PlannedWork);
Console.WriteLine("ActualWork----->" + work.ActualWork);
Console.WriteLine("StartDate----->" + work.Start);
Console.WriteLine("TaskComment----->" + work.Comment);
}
}