1 string a = "4546311.670";
 2 string b = "318241.810";
 3 WriteText("float:");
 4 WriteText(a);
 5 WriteText("+");
 6 WriteText(b);
 7 float fa = Convert.ToSingle(a);
 8 float fb = Convert.ToSingle(b);
 9 WriteText("=");
10 float fc = fa + fb;
11 WriteText(string.Format("{0:0.00}",fc));
12 decimal da = Convert.ToDecimal(a);
13 decimal db = Convert.ToDecimal(b);
14 WriteText("\n\r");
15 WriteText("decimal:");
16 WriteText(a);
17 WriteText("+");
18 WriteText(b);
19 WriteText("=");
20 WriteText((da + db).ToString());