Working with numeric calculations in form controls using ASP.NET web forms

Question

I've been practicing with asp.net web forms and controls and have now become a bit stuck on the best way to work with numeric data in user input forms for instance a simple example would be a input field called 'length' and one called width the user clicks a button and the result of L * W is calculated and display.

I have tested converting strings to int using Convert.ToInt32(strvalue2); and out-putting the results to the Console ok.

But when i try and convert them and output them to a form control using something like this:

        string strvaluel = length.Text;
        string strvalueW = width.Text;


            int numValuel = Convert.ToInt32(strvaluel);
            int numValueW = Convert.ToInt32(strvalueW);
            outputbox.Text   = numValuel * numValueW;  (error cannot explicitly convert    type 'int' to 'string'

I'm very new to asp.net so any help would be appreciated

On a side note, you should use int.TryParse() to convert a string to an integer when the string is user supplied, so that you can gracefully handle the case where they enter a non-integer value. — Servy
– Servy, Commented Jun 7, 2012 at 16:22

D Stanley · Accepted Answer · 2012-06-07 16:20:35Z

6

Convert it to a string:

outputbox.Text = (numValuel * numValueW).ToString();

If you want more control over formatting (commas, etc.) use a format string:

outputbox.Text = string.Format("{0:N}",numValuel * numValueW);

See the documentation on format strings for more details

answered Jun 7, 2012 at 16:20

D Stanley

153k12 gold badges189 silver badges257 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Ledgemonkey Over a year ago

@D Stanley so does the .ToString(); convert the int's back to strings after the calculation ? many thanks

D Stanley Over a year ago

@Ledgemoneky The result of the calculation is converted, not the arguments. It's the equivalent of int i = numValuel * numValueW; outputbox.Text = i.ToString();. The original values are unchanged, if that's what you're asking.

Collectives™ on Stack Overflow

Working with numeric calculations in form controls using ASP.NET web forms

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related