Change format of outcome of Sum

Question

I make a simple calculation with some Entry's , that works but this is not the format i really am looking for.

Totaaltanks.Text = total.ToString("N0", CultureInfo.InvariantCulture);

The outcome is for example 10,245,458
The format that i am looking for is that the outcome is 10245,458
With 1 comma only .

Tryed al lot of options but cannot find the one i am looking for.

Answer 1

Hello,
Welcome to our Microsoft Q&A platform!
You could have a try to use String.Format and #, it can be formatted by "-""/""?" or some other character , but it can't be formatted by comma.

MyEntry.Text = string.Format("{0:#######-###}", totle);  

Because comma turns the number into thousandths. If you want to use comma, you could use NumberFormatInfo.

double a = 12345678.876555;  
int b = 99999;  
double totle = a + b;  
NumberFormatInfo nfo = new NumberFormatInfo();  
nfo.CurrencyGroupSeparator = ",";  
nfo.CurrencyGroupSizes = new int[] { 3, 5 };  
nfo.CurrencySymbol = "";  
MyEntry.Text = totle.ToString("c0", nfo);  

In addition, you could insert , into string.

//int a = 1;  
//int b = 9;  
int a = 1111;  
int b = 99999999;  
double totle = a + b;  
string totleString = totle.ToString();  
int length = totleString.Length;  
MyEntry.Text = length>3?totleString.Insert(length-3,","): totleString;  

For more information , you can refer to
https://learn.microsoft.com/en-us/dotnet/api/system.string.format?view=net-5.0#Starting
Best Regards,
Wenyan Zhang

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Answer 2

Thanks Wenyan Zhang ,

I used this

int a = 1111;
 int b = 99999999;
 double totle = a + b;
 string totleString = totle.ToString();
 int length = totleString.Length;
 MyEntry.Text = length>3?totleString.Insert(length-3,","): totleString;