Can't Seem To Add 1 To An Existing File?

Dec 31, 2010

I know how to write and read files but I can't seem to add 1 to an existing file.

This file currently contains "10" but when I click a button I want it to +1 to that number.

I've tried a.WriteLine(+= 1) but it gives me an Expression Expected erorr which I don't get how to fix or what's wrong with it.

If anyone can help me fix or give another code that +1 to the existing numbere.

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