How to add a column into DataTabe in the first place

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I used the code below to add a column to a DataTable(ds is a DataSet)
But the new column is always in the last place.
How to add a column into DataTabe in the first place

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[Teemu Keiski]

Why does the order of columns matter?

 

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I want to added column to be display in the first place of a dataGrid