When converting double to string, how can I round it up to N decimal places in C#? [duplicate]

Question

Possible Duplicate:
Round a double to 2 significant figures after decimal point

I need at most N decimals, no more, but I don't want trailing zeroes. For example, if N = 2 then

15.352
15.355
15.3
15

should become (respectively)

15.35
15.36
15.3
15

Answer 1

Try Math.Round(value, 2).ToString()

Math.Round(15.352, 2).ToString();  //15.35
Math.Round(15.355, 2).ToString();  //15.36
Math.Round(15.3, 2).ToString();    //15.3
Math.Round(15.0, 2).ToString();    //15

The second paramater for round is for you to specify how many decimal places to round to. It will round up by default.

Answer 2

This can be done by using a custom format string, such as "0.##", which displays a maximum two decimal places.

String.Format("{0:0.##}", 123.4567);      // "123.46"

Reference: http://www.csharp-examples.net/string-format-double/