Converting a string to a float data type

I need to convert the contents of a Textbox (which is currency) to a datatype float.
Would I convert to single?

txtPurchItemCorrectPrice.Text.Trim();

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

If you’re dealing with currency then I would use double at the very least, if not decimal. That said you want:

double value = double.Parse(txtPurchItemCorrectPrice.Text.Trim());

If you’re not sure whether it will be a number or not:

double value;
bool isOK = double.TryParse(txtPurchItemCorrectPrice.Text.Trim(), out value);

Method 2

Do you mean the C# float type?

float f = float.Parse(text);

Or…

float value;
if (float.TryParse(text, out value))
{
     // Yay!
}
else
{
     // Boo! Parse failed...
}

Note that the code above will use the current culture. You may want to specify a different culture, e.g.

...
if (float.TryParse(text, out value, NumberStyles.Float,
                   CultureInfo.InvariantCulture))
...

EDIT: If this is actually a float column in a database, you may want to use double instead.

Note that currency information should usually not be stored in using float/double; it should be stored using a decimal type, e.g. decimal (C#) and NUMBER (SQL).

Method 3

float.TryParse(…)

That avoids raising an exception on invalid input.

Method 4

Dim x As Double = Convert.ToDouble(txtPurchItemCorrectPrice.Text.Trim())

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0