textbox配合PopupControlExtender-選擇日期

'前台

        PopupControlID="pnlCalendar" TargetControlID="tbReturn" Position="Bottom" >

'後台

Protected Sub c1_SelectionChanged(sender As Object, e As System.EventArgs) Handles c1.SelectionChanged

        Me.PopupControlExtender1.Commit(Me.c1.SelectedDate.Date)

    End Sub