Generate 29 days of February in .NET - vb.net

Question

I am trying to populate a dropdown with No.of days generated by the system by the following code
Sub LoadDay()
Try
ddlDay.Items.Clear()
For i As Integer = 1 To System.DateTime.DaysInMonth(DateTime.Today.Year, ddlMonth.SelectedValue)
ddlDay.Items.Add(New ListItem(i.ToString(), i.ToString("00")))
Next
ddlDay.Items.Insert(0, New ListItem("--Select--", -999))
Catch ex As Exception
End Try
End Sub
Problem is, for the month of February it shows only 28 days because the following code generates Days on the basis of current year and this year isn't a leap year
System.DateTime.DaysInMonth(DateTime.Today.Year, ddlMonth.SelectedValue)
How can I fix it to always show 29 days for the month of Februaray?

Answer 1

You can use DayInMonth in DateTime
Dim dayinMonth As String
dayinMonth = System.DateTime.DaysInMonth(2012, 2)
This allow you to know the day in month for 2015 February. Parameter inside stand for year and month

Answer 2

I'd be interested in knowing what your requirment is that you have to be able to select invalid days, but, if you don't want your days to change based on the year, just create your own array of days. This leaves your intent a bit more clear than putting an arbitrary year in the DaysInMonth function.
Dim Days = {31,28,31,30,31,30,31,31,30,31,30,31}
ddlDay.Items.Clear()
For i As Integer = 1 To Days(ddlMonth.SelectedValue-1)
ddlDay.Items.Add(New ListItem(i.ToString(), i.ToString("00")))
Next
ddlDay.Items.Insert(0, New ListItem("--Select--", -999))