For Each dr1 As Data Row In DataTables("表A").Select("[日期] >= #" & dt & "#")
Dim dr2 As DataRow = DataTables("表B").find("编号='" & dr1("编号") & "'")
if dr2 is nothing then
dr2 = DataTables("表B").AddNew()
end if
For Each dc As DataCol In DataTables("表A").DataCols
dr2(dc.Name) = dr1(dc.name)
Next
Next