asp.net中计算两个日期之间的相差的天数的方法(vb)

Dim a As Date
Dim b As Date
a = System.DateTime.Now
b = CDate(chkExport.Text)
Dim ts As System.TimeSpan
ts = a.Subtract(b)
Dim pp As Integer
pp = CInt(ts.TotalDays)
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