nextdate1='2014-12-20'

today    `='2014-12-18'`

DateTime nexdate1 = dr.GetDateTime(2);//gets from database. I checked and the value is correct
DateTime today = DateTime.Now;
TimeSpan nextdate = nexdate1.Subtract(today);
//TimeSpan nextdate = nexdate1-today;//This method also applied
int difference = nextdate.Days;