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Help Me.. Textbox That Wud Accept Numbers Up To 2 Decimal Places


i have a problem..

I was asked to, create a textbox, (txtUnitPrice), that would allow input of Numbers only,
requirements:
*accept numbers only
*up to 2 decimal places
    once the decimal(.) was pressed, only 2 numbers are allowed,
*no repetition of (.) decimal

for example
 2,896.75 or
 2896.75

once i input Price on the textbox, i wont be allowed to pressed (.)decimal twice

Please help me. i really dont know what to do..
I know how to use the keyascii for Numeric input only..

i just really dont know, how can i set .00 2 decimals only

My teacher suggest that i may use

instr(start,string)
instr(txtUnitPrice,".") i dont know whats next

should i use counter..?? pls help me..
i would really appreciate... pls




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