asp.net C # reserved decimal Places collection of methods

ASP tutorial. NET C # A collection of methods for preserving decimal places
2. Keep n bit, rounded.

Decimal d= Decimal.round (Decimal.Parse ("0.55555"), 2);

3. Keep N bit rounded

Math.Round (0.55555,2)

4, keep n bit rounded
Double dbdata = 0.55555;
String str1 = dbdata.tostring ("F2");//fn keep n bit, rounded

5. Keep N bit rounded

string result = String.Format ("{0:n2}", 0.55555);//2 bit

string result = String.Format ("{0:n3}", 0.55555);//3 bits

6. Keep n-bit rounded (yes)

Double s=0.55555;
Result=s.tostring ("#0.00"); a few 0 on the back of the point keep a few

In C #, if you show how to keep the decimal digits, and the percent-semicolon solution:

1, with the NumberFormatInfo class to solve:
System.Globalization.NumberFormatInfo Provider = new System.Globalization.NumberFormatInfo ();

Provider.percentdecimaldigits = 2;//A decimal point to retain several digits.
Provider.percentpositivepattern = where 2;//percent signs appear.
Double result = (double) 1/3;//Be sure to use double type.
Response.Write (Result.tostring ("P", provider));

2, with the ToString method.:
public string getrate (double Hcount, double task)
{
String rvalue;
String temp = "";

if (task = 0)
{
task = 1;
}

Double db = (hcount/task) * 100;

if (Hcount >= Task)
{
Rvalue = "100%";
}
Else
{
Rvalue = db.tostring ("#0. #0") + "%";
}
return rvalue;
}

String str1 = String.Format ("{0:n1}", 56789); result:56,789.0
String str2 = String.Format ("{0:n2}", 56789); result:56,789.00
String str3 = String.Format ("{0:n3}", 56789); result:56,789.000
String str8 = String.Format ("{0:f1}", 56789); result:56789.0
String STR9 = String.Format ("{0:f2}", 56789); result:56789.00
String str11 = (56789/100.0). ToString ("#.##"); result:567.89
String str12 = (56789/100). ToString ("#.##"); result:567