I want to count number of days using two datetime picker. Please take a look the picture below.
image1

But, if you can see the image below., they counting number of days PER DAY,
image2

that’s why the total number of days display is equal to 2 days.
image3

instead of one day, because of time.
image4

I have a code to count number of day

 DateTime dt1 = dtpckerPickupDate.Value;
                    DateTime dt2 = dtpckerReturnDate.Value;
                    TimeSpan t = dt2 - dt1;

                    double dDays = t.TotalDays;
                    //int days = Convert.ToInt32(dDays);
                    int PlusOneDay = Convert.ToInt32(dDays + 1);//if counting included today

                    txtNumOfDays.Text = PlusOneDay.ToString() + " Days";