Putting individual sections of a date (yyyy/mm/dd) from Combo Boxes

Hey guys,
I've hit a hitch in my computing project. I want to actually create a date out of values held in combo boxes.



Now, the "Year" combo box is filled at the frmAddCustomer_Load event using this code:

Dim DateYearIndex As Integer
        For DateYearIndex = 1900 To Today.Year
            cmbYear.Items.Add(DateYearIndex)
        Next

At the cmbYear_SelectedIndexChanged event, the cmbMonth control is filled using:

Dim DateMonthIndex as Integer

For DateMonthIndex = 1 To 12
     cmbMonth.Items.Add(DateMonthIndex)
Next       

And the cmbDay control is filled in the same way.

Now, my question is: how would one take all the individual integers (DateYearIndex, DateMonthIndex, DateDayIndex) and combine them to make a single date (dd/mm/yyyy)?

I've tried this code:

  
Dim Year, Month, Day As Integer
Dim DateOfBirth As New Date(Day, Month, Year)

        Year = cmbYear.Text
        Month = cmbMonth.Text
        Day = cmbDay.Text

        lblShowDate.Text = DateOfBirth

but it gives me this error:



Could anyone shed some light on what might be happening, and how I could solve this? I'm pretty confident with VB.NET, but I've not been programming very long. Do I need to make a custom format, or is there a special process for converting integers into a date?


Thanks people! />/>