add textbox values

M

Mike

Is there a way to add 4 textbox values without the use of a button and a
postback?

I need to add 4 textboxes and the total should change everytime a new number
is entered in any box.
I tried this once but the postback is causing an 'input string not correct
format' error message when the page first loads and the user enters a number
in any of the textboxes.
 

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