try using the Date property on the DateTime Object.
..
if(dtOne.Date == dtTwo.Date)
...
Or Else For a true comparison
..
dateTime1.Date.CompareTo(dateTime2.Date);
..
Or Last Might That I have coded
..
DateTime dt1 = DateTime.Now.Date;
DateTime dt2 = Convert.ToDateTime(TextBox4.Text.Trim()).Date;
if (dt1 >= dt2)
{
MessageBox.Show("Valid Date");
}
else
{
MessageBox.Show("Invalid Date... Please Give Correct Date....");
}