C # How to retain decimal places

1.System. Globalization. NumberFormatInfo provider = new System. Globalization. NumberFormatInfo ();
Provider. NumberDecimalDigits = intDecLength; // number of decimal places to be set
Double strCashAmt=Convert.ToDouble(this.txt CashAmt. Text); // convert the value in the control to double
This.txt CashAmt. Text = strCashAmt. ToString ("N", provider); // use the ToString function to format decimal places.

2. Keep N bits, rounded down.

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

3. Keep N digits rounded

Math. Round (0.55555, 2)

4. Keep N digits rounded

Double dbdata = 0.55555;

String str1 = dbdata. ToString ("f2"); // fN retains N bits, rounded

5. Keep N digits rounded

String result = String. Format ("{0: N2}", 0.55555); // two digits
String result = String. Format ("{0: N3}", 0.55555); // three digits

6. Keep N digits rounded (good)

Double s = 0.55555;

Result = s. ToString ("#0.00"); // a few digits are retained after a few zeros.

C # solution for displaying the number of decimals retained and percentage signs:

1. Use the NumberFormatInfo class to solve the problem:

System. Globalization. NumberFormatInfo provider = new System. Globalization. NumberFormatInfo ();
Provider. PercentDecimalDigits = 2; // number of decimal places reserved.
Provider. PercentPositivePattern = 2; // Where is the percent sign.
Double result = (double) 1/3; // be sure to use the double type.
Response. Write (result. ToString ("P", provider ));
2. Use 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