How to get the amount of memory available programmatically?

Hello,
Out of memory is a very common situation occures in most applications. I was wondering if there is a way to find the amount of free memory available programmatically, it can atleast help a little. There are System class's functions but are not very full-proof. So can there be any other way?
THanks

Out of memory is a very common situation occures in most applications.Really? ;)

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        M100        02          1000.-
        M200        02          2000.-
        Operation:   WPBPC
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        WType       WPBP        Amount
        M100        01          3000.-
        M100        02          3000.-
        M200        02          2000.-
    Regards
    Team Member.

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