Data format constraint

I am working on a Point of sale module for a web application. I need help ensuring my data stays in a money format ie 0.00



Here's my code:

Code:

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            Double res = Double.Parse(PriceTxtBox.Text);
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            res = res * Double.Parse(QtyTxtBox.Text);
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            ItemTotalTxtBox.Text = res.ToString();
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            if (ItemTotalTxtBox != null)
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            {
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                Double rs = Double.Parse(ItemTotalTxtBox.Text);
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                rs = (rs * (.075)) + Double.Parse(ItemTotalTxtBox.Text);
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                Double ts = (rs *(.075));
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                TotalTxtBox.Text = rs.ToString();
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                TaxTxtBox.Text = ts.ToString();
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            }

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I can handle constraing the input on the client side.

When PriceTxtBox is 2 and QtyTxtBox is 3 I need the result to be 6.00 not 6 like I am getting now.

When ItemTotalTxtBox is 4.67 I need TotalTxtBox to be 0.35 not 0.35025 like I am getting now.



Thanks in advance.

There are a couple of ways of doing what you want... either format the number as you want it displayed, or use a Masked Editbox to control the format of input/output...

For some formatting thoughts, see http://www.csharp-examples.net/string-format-double/

Gives a few examples and outputing a number in various ways... there are many more resources like that throughout the web... google "c# format double".

Best of luck!

'double' is the incorrect datatype to use for money. You should be using the decimal type. If you don't, then you'll run into rounding issues all the time which will throw the balance off.

As for displaying the correct value on the till, .ToString () won't do the job unfortunately as it doesn't enforce that only 2 decimal places will be displayed. You can probably use ToString ("{0:0.00}") which will enforce exactly two decimal places are used to display the number. I don't think this method rounds the value though, so 2.999 would show up as 2.99 instead of 3.00 as you might want.

Sounds like you need to use rounding
http://www.dotnetperls.com/math-round

and formatting
http://www.dijksterhuis.org/formatti...-stringformat/

I would make a "String DoubleToDollars(double amount)" function

Code:

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double dDollars,dCents;
String sDollars,sCents;

dDollars=amount-floor(amount)
dCents=amount-Dollars

sDollars=dDollars.tostring();
if dCents==0
    sCents="00";
else sCents=dCents.ToString();

//return "$"+sDollars+"."+sCents;
//add commas to for sDollars? $1,302.01 looks better than $1302.01?

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When you want to control how money is displayed, then control how money is displayed! Hooray tautology!