how can i convert time span to a double value

Question

  TimeSpan totaldays = endtime.Subtract(starttime);
  double tdays = Convert.ToDouble(totaldays);

I m getting here error as

Unable to cast object of type 'System.TimeSpan' to type 'System.IConvertible'.

how can I get timespan value as a double type

Answer 1

being more simple

  double d=(endtime-starttime).totaldays;

worked for me.can reduce number of code lines.

Answer 2

Just need to use the TimeSpan.TotalDays property

TimeSpan totaldays = endtime.Subtract(starttime);
double tdays = totaldays.TotalDays;