round a number to the nearest thousandth in csharp

To round a number to the nearest thousandth in csharp, you can use the Math.Round method and specify the number of decimal places to round to. Here's an example:

main.cs
double number = 123.456789;
double roundedNumber = Math.Round(number, 3); // roundedNumber = 123.457
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Note that the Math.Round method returns a double, so if you need the rounded number as a string with a specific format, you can use the ToString method with a format string. Here's an example:

main.cs
double number = 123.456789;
string roundedString = Math.Round(number, 3).ToString("0.000"); // roundedString = "123.457"
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