Trouble converting string to double

[ricky_cpp]

Hello,

I have trouble in converting string to double. I am using following code:

float[] aData = new float[0];
aData[0] = System.Convert.ToSingle(s.ToString(), CultureInfo.CurrentUICulture); /** doesn't matter if I use Culture info or not */
//or     
float.TryParse(s.ToString(), NumberStyles.AllowDecimalPoint, CultureInfo.CurrentUICulture, out aData[0]);

If my string is 123.56 then output in aData[0] (followed in memory) is 123.560000000000003. I do not know from where I am getting 3 in the end. It is sometimes 1, sometimes 2 etc. The best example I could find was: if the input string is 981.55, the coversion to double results in 981.54999999999995

Any hint how can I correct it?

Regards
Ricky