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Currency localization and handling in C#

I am looking for a strategy to implement different currencies in my system.
For GB I use pounds locale and it works ok with numbers like "7.55", but as soon I change locale to Spanish for example I get the "7,55" number and I cannot handle it.
So the first thing is that I calculate some amount with JavaScript client side and JavaScript cannot calculate comma numbers, nor I can parseFloat, nor converting to decimal number if I don't replace commas with numbers like:
input.val().replace(',', '.');
I mean I don't understand how to handle this properly in scenarios when you have to make payment. When to convert for calculations, etc.
Is there any proper way to do this in .net with JavaScript help? Just need some tips.

In c#, you can use CultureInfo.InvariantCulture for this. You have a full snippet about currency here.
string str = "42.5";
float numFloat = float.Parse(str, CultureInfo.InvariantCulture);
Learn more from the msdn.

Parsing Text from a Masked Text Box

I have a WinForms application written in C#
I have until recently many textboxes on my forms where the user inputs financial amounts. I have not incorporated any form of mask initially and whenever I need to work with the values input by the users I would Parse the text from each box into Decimal values with Decimal.Parse;
However I have been asked to make the textboxes look like financial amounts
i.e. £1,050.75 rather than 1050.75
I therefore started to change the textboxes into MaskedTextBox and gave them a Mask of £#,##0.00
However now each attempt to Parse the text from the MaskedTextBoxes gives an error 'Input string not in the correct format'.
How do I obtain the users input from the MaskedTextBox and parse into decimal format to work with?
Should I be using MaskedTextBox at all, or is there another way of showing a financial type formatting on the form, without effecting the Decimal.Parse method?

When you are getting the value from Maskedtextbox, it is taking the value as £#,##0.00 . so the symbol will not be converted to decimal. Try to remove the symbol and convert the value to decimal. like
string val= maskedTextBox1.Text.Replace("£","");
Decimal.Parse(val);

You can use a format option with AllowCurrencySymbol. It has to match the currency symbol of the culture. This code I converted from VB so I hope it's correct.
Application.CurrentCulture = New Globalization.CultureInfo("en-GB");
Decimal.Parse("£12,345.67", Globalization.NumberStyles.AllowThousands | Globalization.NumberStyles.AllowDecimalPoint | Globalization.NumberStyles.AllowCurrencySymbol);
Also, see this question if you don't want to change the culture:
Problem parsing currency text to decimal type

You can check MaskFull to see if text is properly enter and then apply anti-mask (by removing that, what your mask is adding).
Unfortunately, I am not aware about automated unmasking. But you can do something like:
if(maskedTextBox1.Mask)
{
var enteredText = maskedTextBox1.SubString(1).Replace(",", null); // remove pound symbol and commas
// ... parse as with normal TextBox
}

Formatting textbox c# and using it unformatted value

I´m using some textboxes to show totals, subtotals and discounts. I´m converting decimals to string to represent them in the textbox. Also, I would like to have the "$" at the beginning.
I have achieved this by using this:
tbx_total.Text = total.ToString("$ ##0.##");
Graphically, this is working great, but my big problem is that I need that textbox value to calculate other ones. Basically, I get a formatting error during runtime when I try to convert that textbox text to decimal. Obviously, this is due to the ToString("$ ##0.##") format. Is there any way to get the value without the format?

One simple solution will be:
tbx_total.Text = total.ToString("$ ##0.##");
tbx_total.Tag = total;
Then use tbx_total.Tag property for further usage.

When reading it back in you can parse with NumberStyles to get your desired effect. There is a number of bit-wise operations on NumberStyles so I suggest researching how to use them for more flexibility:
double.Parse(total, NumberStyles.Currency);
Also I tend to like this for formatting currency a bit more but purely stylistic.
String.Format("{0:C}", total);
Note: Parsing back and forth does incur some overhead so depending on the amount of data it may be more wise to offload the value to an object and reference that when you need the decimal value again.

As an alternative, you can do this, whenever you read the value:
double value = 0;
if (!double.TryParse(tbx_total.Text.TrimStart(new char[] { '$', ' ' }), out value))
{
//Ooops... not a valid number
}
So here you basically remove the added '$' and space before the number enabling you to parse it as a double. This way you can check if the number has been entered correctly (provided that the user can edit the textbox.

I think you should store your original values (decimal) in a DataTable or some other collection and use these values to calculate what you need.
So you can format decimal values in any format you like without warry about how to convert back from strings.

Formatting currency in .NET

I am formatting the currency using Tostring() method i m using following syntax
ToString('##.##') it is working perfectly but in case of round number it remove last 2 zero
like for 100 it does not show 100.00 is shows 100.
how can i format in that way means
input desired output
100 100.00
100.10 100.10

Try "##.00" instead.
That will force two digits after the decimal separator.
You can also use ToString("C") to use the culture specific format in Windows directly.

First google result.
String.Format("{0:C}", x.ToString());
http://www.howtogeek.com/howto/programming/format-a-string-as-currency-in-c/

You can use :
.ToString("C")
Hope it helps.

Also, if you don't want the currency sign ($ in the US) added that "C" gives, you can also use "F2", which is "fixed number with 2 decimal places". It also has the advantage of giving you a thousands separator when you results go over 1,000.00.

This might help. Might be more than you need, but it takes globalization into account which might be necessary. "C" is also a short-cut currency format string that might get you further along.

Number Formatting in Thousands

How, for example, do I turn the number 10562.3093 into 10,562 in C#?
Also, how do I ensure that same formatter will apply correctly to all other numbers?....
...For example 2500.32 into 2,500
Help greatly appreciated.

string formatted = value.ToString("N0");
This divides your number in the manner specified by the current culture (in the case of "en-US," it's a comma per multiple of 1000) and includes no decimal places.
The best place to look for any question regarding formatting numbers in .NET would have to be here:
Standard Numeric Format Strings (MSDN)
And here:
Custom Numeric Format Strings (MSDN)

string.Format("{0:n0}", 10562.3093);

String.Format("{0:0,0}", 10562.3093);
I keep this website bookmarked for these purposes: String Formatting in C#

double x = 10562.3093;
x.ToString("#,0");
or
String.Format("{0:#,0}", 10562.3093);