Reg. Datat Table Filter Using Two Columns

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C#

DataTable

I have a data table containing the following values :

NAME    OLD_ID     NEW_ID

A         12         12
B         23         19
C         56         48

I want to filter above data table where the OLD_ID!=NEW_ID

Currently I have written the filter statement as follows:

DataRow[] rows = null
rows = dt.Select("OLD_ID != NEW_ID")

and it is giving the error that

Cannot interpret token "!" at position 8

So anyone can tell that what is the wrong in the filter statement?