Since you said you want to avoid String.Replace:
double value = 999.56m;
CultureInfo info = CultureInfo.GetCultureInfo("en-US");
string s = (10000 * value).ToString("00000000000000", info));
Console.WriteLine(s);
But there is really nothing wrong with that:
double value = 999.56m;
CultureInfo info = CultureInfo.GetCultureInfo("en-US");
string s = value.ToString("0000000000.0000", info).Replace(
info.NumberFormat.NumberDecimalSeparator,
String.Empty)
Console.WriteLine(s);
jason source
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