string strDateOfStart = "2008-08-10";
string strDateOfEnd = "2008-08-18";
DateTime dtStartDate = new DateTime(int.Parse(strDateOfStart.Substring(0, 4)),
int.Parse(strDateOfStart.Substring(5, 2)),
int.Parse(strDateOfStart.Substring(8, 2)));
DateTime dtEndDate = new DateTime(int.Parse(strDateOfEnd.Substring(0, 4)),
int.Parse(strDateOfEnd.Substring(5, 2)),
int.Parse(strDateOfEnd.Substring(8, 2)));
TimeSpan tsTimeDifference = dtEndDate.Subtract(dtStartDate);
string date = tsTimeDifference.ToString();
string[] str = date.Split(':');
string exactdate = str[0];
string[] strm = exactdate.Split('.');
txtTotalDays.Text= strm[0];
Try this..
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