Convert float to double loses precision but not via ToString

Question

I have the following code:

float f = 0.3f;
double d1 = System.Convert.ToDouble(f);
double d2 = System.Convert.ToDouble(f.ToString());

The r

Answer 1

I use decimal cast for correct result in this case and same other case

float ff = 99.95f;
double dd = (double)(decimal)ff;