Find duplicate points in a given point layer(arcgis)

Hi,

The way is calculate x and y coordinates for all points.Then join x and y as like below

ex:
x co-ordinate: Y co-ordinate: XY
12 13 1213

Then Summarize the XY filed.that ask you to save the result as a dbf file.

open the dbf file,check count filed,if there is no duplicate the column will be filled with one other wise more than 1
Thanks,
Saravanan