Returns a string representation of the value of the current instance.
A string representation of the current instance formatted using the general format specifier, ("G"). The string takes into account the current system culture.
This version of double.ToString is equivalent to double.ToString (null, null ).
The general format specifier formats the number in either fixed-point or exponential notation form. For a detailed description of the general format, see the IFormattable interface.
This method overrides object.ToString.