How to calculate percentage in C# windows application

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I want to calculate percentage, and I have done it but unable to get value in which format I want.
suppose I am calculating following
(579803.4 * 14%)=81,172.476
but I want to 81,172.48 after calculation. what should I do?

Thanks In advance

What I have tried:

textBox1.Text = (((float.Parse(textBox2.Text)) * (float.Parse(textBox3.Text)) / 100)).ToString();

Posted 28-Apr-16 3:57am

arvindispra

Updated 29-Jun-21 7:52am

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Richard Deeming 28-Apr-16 10:08am

What if the user enters something that's not a valid number? Your code will fail with an exception. You should use the TryParse[^] method instead; that way, you can display a suitable error message if one of the values isn't a number.

3 solutions

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phil.o · Accepted Answer · 2016-04-28T04:03:00

Solution 2

Try

C#

textBox1.Text = (((float.Parse(textBox2.Text)) * (float.Parse(textBox3.Text)) / 100)).ToString("F2");

Posted 28-Apr-16 4:03am

phil.o

OriginalGriff · Accepted Answer · 2016-04-28T04:09:00

First off, don't use Parse on user input: use TryParse instead:

C#

double d1, d2;
if (!double.TryParse(textBox2.Text, out d1))
    {
    MessageBox.Show(string.Format("{0} is not a number", textBox2.Text));
    return;
    }
if (!double.TryParse(textBox3.Text, out d2))
    {
    MessageBox.Show(string.Format("{0} is not a number", textBox3.Text));
    return;
    }
textBox1.Text = (d1 * d2 / 100).ToString("#.00");

That way, your app won't crash if your user misskeys...

Nigam,Ashish · Accepted Answer · 2016-04-28T04:01:00

Solution 1

Use

ToString("0.00"); //2dp Number

Or

Math.Round(yourAmount,2)

for 2 decimal.

Posted 28-Apr-16 4:01am

Nigam,Ashish

Updated 28-Apr-16 4:03am

v2