I want get a root of number in C#
what library i must to insert and what command solve it

System.Math.Sqrt();

thanks a lot

In addition to that : a root of a number cannot only refer to the square root, but also the cube root,... Nth root.
To do this in C# you can do something like:

double num = 8.0;
double power = 1.0 / 3;
Console.WriteLine("Cube root of {0} is {1}.", num, Math.Pow(num, power));
commented: Cave ab homine unius libri. +13
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