Question

I have this line of code in c# but i it always resets the textbox back to the format 0.00, how can i make it so that it keeps the format 0.000 ?.

NewYorkTax = Convert.ToDecimal(txtNewYorkTax.Text);
 //converts it but with 0.00, I need 0.000 or 7.861 etc..

SIDE NOTE:
NewYorkTax is of type Decimal, I need to keep this variable.. any ideas?

Thank you

Answer 1

You need to format the string in your textbox:

decimal NewYorkTax = Convert.ToDecimal(txtNewYorkTax.Text);

//... code that is doing stuff with the decimal value ...

txtNewYorkTax.Text = String.Format("{0:0.000}", NewYorkTax);

EDIT: Clarified the use of String.Format

Second edit: Regarding exceptions

Also bear in mind the risk of converting to decimal when taking in human input. Humans are error-prone creatures. 🙂

It helps to use TryParse, which Decimal supports:

decimal NewYorkTax;

if (Decimal.TryParse(txtNewYorkTax.Text, out NewYorkTax)) // Returns true on valid input, on top of converting your string to decimal.
{
    // ... code that is doing stuff with the decimal value ...

    txtNewYorkTax.Text = String.Format("{0:0.000}", NewYorkTax);
}
else
{
    // do your error handling here.
}