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C# format to thousand seperator

I am trying to format user input to a thousand seperator format. I tried the code here, but it keeps breaking the application:
Amt.Text = String.Format("{0:0,0.00}", Convert.ToDouble(Amt));
So when the user inputs 3566412, then it needs to convert automatically to 3,566,412

You are trying to convert the control (named Amt) to a double, which is a bad idea since you want to convert the text of the control (Amt.Text). I would suggest to use a decimal since that is more precise and will not cause floating point issues:
Amt.Text = String.Format("{0:0,0.00}", Convert.ToDecimal(Amt.Text));
Another thing to consider is to use a control that can mask itself, so you don't need to replace the text yourself every time.

You might want to check out Standard Numeric Format Strings at MSDN
Then you could do something like
Amt.Text = inputnumber.ToString("N");
Which will format 3566412 to 3,566,412.0
If you want to take it directly from the textbox, you could do something like this, which checks if the text can be parsed before setting the text
double result = 0;
if (double.TryParse(Amt.Text, out result)
{
Amt.Text = result.ToString("N");
}

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.

Which passwordchar shows a black dot (•) in a winforms textbox using code? [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Which passwordchar shows a black dot (•) in a winforms textbox?
Unicode encoding for string literals in C++11
I want to use code to reveal the password or make it a dot like •
textBoxNewPassword.PasswordChar = (char)0149;
How can I achieve this?

http://blog.billsdon.com/2011/04/dot-password-character-c/ suggests '\u25CF';
Or try copy pasting this •

(not exactly an answer to your question, but still)
You can also use the UseSystemPasswordChar property to select the default password character of the system:
textBoxNewPassword.UseSystemPasswordChar = true;
Often mapped to the dot, and always creating a consistent user experience.

You need to look into using the PasswordBox control and setting the PasswordChar as *.
Example:
textBox1.PasswordChar = '*'; // Set a text box for password input

Wikipedia has a table of similar symbols.
In C#, to make a char literal corresponding to U+2022 (for example) use '\u2022'. (It's also fine to cast an integer literal as you do in your question, (char)8226)
Late addition. The reason why your original approach was unsuccessful, is that the value 149 you had is not a Unicode code point. Instead it comes from Windows-1252, and Windows-1252 is not a subset of Unicode. In Unicode, decimal 149 means the C1 control code "Message Waiting".
You could translate from Windows-1252 with:
textBoxNewPassword.PasswordChar =
Encoding.GetEncoding("Windows-1252").GetString(new byte[] { 149, })[0];
but it is easier to use the Unicode value directly of course.
In newer versions of .NET, you need to call:
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
before you can use something like Encoding.GetEncoding("Windows-1252").

textBoxNewPassword.PasswordChar = '\u25CF';

Getting values from Masked text box

I've set MaskedTextBox's Mask to: "Fl\air H\al ###.## , something here: ####.##"
When user inputs the value final text looks something like this:
Flair Hal 987.67 , something here: 1234.12
What will be the best way to extract 976.67 and 1234.12 from the MaskedTextBox's Text. I am looking for a List which will have all the values of the mask (976.67, 1234.12).
There can be any number of masks in the mask string and the mask can be any valid mask.
I am thinking of first removing '\' from the Mask and then in a for loop keep comparing the Mask with the Text and detect changes and add them to the List. But this doesnt sound good to me and i think there probably is a better way of doing it.

There are four values of the mask in your example: 987, 67, 1234, 12. The fact that blocks separated by a . are treated as one is your own logic, so I think you will just have to write code to get the information yourself.
Have a look at the MaskedTextProvider property of the MaskedTextBox, and its EditPositions property. The EditPositions give you the positions within the Text that the user could enter.

Well i found out that there is no good way of doing it. As adrianbanks said i have to code myself to get this information.
I have written my own usercontrol which uses combination of labels and maskedtexboxes to get the input.
I use curly braces to indicate where i wan the masked textbox and the user control puts one masked textbox per pair of curly braces.
"Flair Hal {###.##} , something here: {####.##}"
Then I can use the values collection which has the values for the masks.

I would think that you would be to use TextMaskFormat to remove the literals and prompt characters from the .Text property. That way you'd only get the numbers (and spaces).

Use a regular expression. The following regex will work for your example, but you may have to tweak it depending on your actual mask:
\d*[.]\d{2}