hiding duplicate row using Datatable

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C#2.0

.NET3.5

C#

.NET

i have scenario like i have table which contains values like

ord_id product_name
------ -------------
1 xxx
-----------------
2 xyz
---------------
2 xyw
---------------
3 yzx
---------------

in the above example i have two rows with same ord_id but with different product name. i am using a data grid to show the details. i want to show the above values in my data grid as below

ord_id product_name
------ -------------
1 xxx
----------------
2 xyz
xyw
---------------
3 yzx
---------------

how can i do this.please help me in this