The last link is useful. But it is not clear my problem. I have attribute table that have Name and Grid no field. I have to update Name field using Grid no. For Example in the Grid Field (Grid1, Grid2, Gird2, Grid1, Grid1) so I have update Name field like as (Grid1_001, Grid2_001, Grid2_002, Grid1_002, Grid1_003). Kindly suggest me.