how to reverse the the ordinal of the columns in a datatable

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DataTable

hello
i have a datatable with five columns a want to reverse the ordinal of the columns
in this table ... i used this loop but it did not work

dim dt as new datatable
'here we add the columns col1,col2,...col5
dim x as integer = dt.columns.count
for i as integer = 0 to mydatatable.columns.count -1
dt.columns(i).setordinal(x-1-i)
next

when the iteration reaches the middle of the columns number it turns back
the reversed columns to its original ordinal.