Click on button Add Row in grid and Click on another Add Column in grid

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ASP.NET

How to get the following result like:

__________________________________________
M1 | M2 | M3 | button1 |
__________________________________________
a1 | b | C | |
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a2 | b | C | |
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button2| | | |


If click on button 1 to add one more column in between M3 and button1
if click on button 2 to add on more row in between a2 and button2

Please anybody help me.. which control i use?
I'm using ASP.NET 3.5.