C # windows form rounded of a calculation

Question

1.00/5 (1 vote)

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I have a formula below to calculate a column from a datagridview.
How to round with Math.Round (val, 2)

C#

int i;
int NbLig = DGV_P9_Commande.Rows.Count;
Double Val = 0;
for (i = 0; i < NbLig; i++)
{
    Val += Convert.ToDouble(DGV_P9_Commande.Rows[i].Cells[5].Value);

}

Txt_total_P9_cmd.Text = Convert.ToString(Val) + "  €uros H.T";

My result does not work ....

thank you

What I have tried:

Txt_total_P9_cmd.Text = Math.Round((Convert.ToString(Val)), 2) + " €uros H.T";

Posted 17-Jan-20 5:03am

LSB71

Updated 17-Jan-20 6:04am

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Comments

ZurdoDev 17-Jan-20 11:06am

How does it not work?

OriginalGriff 17-Jan-20 11:09am

"It's not working" is one of the most useless problem descriptions we get: it tells us absolutely nothing about the problem. We don't know if you get an error message, or the wrong data, or even that that code compiles successfully!
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Richard Deeming 17-Jan-20 11:44am

It doesn't work because you're converting the number to a string before you attempt to round it.

You can't round a string; you can only round a number.

You need to round the value before you convert it to a string. Phil's answer shows you how.

2 solutions

Solution 2

Thank you,
I changed the format like this : string.Format("{0:0.00}
And I get my result well.
<pre lang="c#">
Txt_total_P9_cmd.Text = string.Format("{0:0.00} Euros H.T.", Math.Round(Val, 2));

Thank you phil.o

Posted 17-Jan-20 6:05am

LSB71

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phil.o · Accepted Answer · 2020-01-17T05:11:00

Solution 1

C#

Txt_total_P9_cmd.Text = string.Format
(
   "{0} €uros H.T.",
   Math.Round(Val, 2)
);

Edit: if it is only a matter of displaying two decimal digits, then:

C#

Txt_total_P9_cmd.Text = string.Format
(
   "{0} €uros H.T.",
   Val.ToString("D2")
);

is more suitable.

Posted 17-Jan-20 5:11am

phil.o

Updated 17-Jan-20 5:50am

v2

Comments

LSB71 17-Jan-20 11:42am

Excuse me, but I don't get the result I want.
The answer from (phil.o) gives me this for example.
Txt_total_P9_cmd.Text = string.Format("{0} €uros H.T.", Math.Round(Val, 2)); = 1254,8
I would like two digits after the decimal point like this (1254.80)
and like this :
Txt_total_P9_cmd.Text = Math.Round(Convert.ToString(Val), 2) + " €uros H.T";
I have the following error (impossible conversion from string to duplicate)

phil.o 17-Jan-20 11:51am

Please see my updated answer.