How to convert a double number to a string while keeping the decimal form?

Question

Programming

There is a code:

double x = 0.00000001;
string str = Convert.ToString(x);

As a result, the line contains "1E-8". How to save the number format and get the string "0.00000001"?

Answer 1

https://msdn.microsoft.com/en-us/library/kfsatb94(v=vs.110).aspx _