public static void Main()
char[] originalChars = "0123456789".ToCharArray();
char[] ReplaceChars = "ABCDEFGHIJ".ToCharArray();
char[] sale = _sale_d.ToString("##.00").ToCharArray();
char[] newSale = new char[sale.Length];
for(int i=0;i<sale.Length; i++)
if(sale[i] == originalChars[j])
newSale[i] = ReplaceChars[j];
Console.WriteLine(new string(newSale));