data list Flow Problem with Repeat coloumn

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ASP.NET

i have some category and sub-categires,

and i display them in two nested data list, but i face problem,that the data list use table formate and when one data of category is long, then it scrach whole row of data list,

like;

Cat-1         cat-2          cat-3
   subcat1      subcat11       subcat21
   subcat2      subcat12       subcat22
                subcat13       subcat23
                subcat14
                subcat15
                subcat16
                subcat17

   Cat-4         cat-5          cat-6
   subcat1      subcat11       subcat21
   subcat2      subcat12       subcat22
                subcat13       subcat23
                subcat14

i want that cat-4 is start just Below of Cat-1 Without Spacing,

For this i use Data list flow property,but when i use datalist flow property,
Repeat coloumn="3" not work,

And i also use repeater, But repeater also not support repeat coloumn property,


so what can i do,

Any control in asp.net for solving My problem ?
Or Any trick for this ?
and Plz provide me any proper solution,which work in my cash

plz help me