About the column display index of datagrid

i need do a customize datagrid, but seems hard to save the
display index of the grid column after the user drag and drop one
column to another postion. What i need is catch the event after
column drag and record that into database, and when reload based on
the record , resort that column display index as saved before, how
to get that

that was i already did before, now even the all columns and
match datafied are dynamic, my question is
when after render all columns , dray a column a from right to
left , after that i can not catch that column display index
in the grid view, the real index in columns of grid is still
remain same , i want catch the dray column event and
get the display index(not the index of columns, but the order
which that column display in the view) and after reload
, i can show those colomns in right order as saved
before

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