主题：请教循环语句的执行顺序,老大请进

DataTables("表A").DataRows.clear
For i As Integer = 0 To 4
    If i = 0  Then
        Dim nr As DataRow = DataTables("表A").AddNew
        nr("第一列") = i
    Else
        Dim drs As List(of DataRow) =  DataTables("表A").Select("第一列 = "& i-1 &"")
        For j As Integer = 0 To drs.count - 1
            Dim nr As DataRow = DataTables("表A").AddNew
            nr("第一列") = i
            nr("第二列") = j
        Next
    End If
Next