how to write M+ button code of calculator in asp.net

how to write  code of  calculator button M+,M-,MS,AC coding in asp.net web form
afrozshaiAsked:
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Shaun KlineLead Software EngineerCommented:
You can use a hidden control to store the amount, using zero as the initial value. When MS is clicked, you overwrite the value of the hidden control with the value entered. When M+ is clicked, you add the value entered to the value in the hidden control. When M- is clicked, you subtract the value entered from the value in the hidden control. For AC (all clear?), set the entered value to zero. AC on many calculators do not clear stored values.

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