Find Total amount of one column in Datagrid and put it in textbox

where should I write this code?
is it in same textbox?

not this what I want
I want to calculate the total amount of the price column which is in datagrid in textbox

Jassimi:

where should I write this code?
is it in same textbox?

-where should I write this code?
I assume you a have a button that would trigger the calculation event. And the code provided you should be in that code block.

-is it in same textbox?
Probably yes? That was just an example if your using other TextBox name then set to the respective textbox!

maybe you can submit you partial code and feed me more of what your trying to do: :-)

sorry for late,
I don't have a button to calculate the event,
I put a textbox under the datagridview to calculate the total amount of the price column,

when I tried your code, it doesn't do that, it just calculate the rows of the datagrid

ok..
its working now but by temptable
not by original database source

thanks