C# DateTimePicker set Date

In the code below, I am attempting to set the date that displays in my datetimepicker after I hit the Drop Down arrow.  I would like to displays today's date in the drop down calendar once I click the Drop Down arrow.  The code I am have below is not working.


 private void dtpChangeEffDate_DropDown(object sender, EventArgs e)
        {
            if (this.dtpChangeEffDate.Value.ToShortDateString() != DateTime.Now.ToShortDateString())
            {
               
                this.dtpChangeEffDate.Value = DateTime.Now;
                this.dtpChangeEffDate.Text = DateTime.Now.ToShortDateString();
            }
        }