Value of type 'Date' cannot be converted to Long ?

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ASP.NET

Hi,
I am getting error as "Value of type 'Date' cannot be converted to Long in "d1" values.

what is the problem...?

see code.

Dim StDate As Date = txtStartdate.Text 'Get the Start Date
    Dim EdDate As Date = txtEndDate.Text 'Get the End Date
    If txtEndDate.Text <> "" Then
        Dim weekYr As String = getWeek(EdDate)  'Get the Current Week
        lblEdWkYr.Text = weekYr 'Display the Week and Year
    End If
    If txtStartdate.Text <> "" And txtEndDate.Text <> "" Then
        Dim d1 As New Date(StDate.ToString)
        Dim d2 As New Date(EdDate.ToString)
        Dim M As Integer = Math.Abs((d1.Year - d2.Year))
        Dim months As Integer = ((M * 12) + Math.Abs((d1.Month - d2.Month)))

        txtDuration.Text = months
    End If