Format currency with string

 The pattern we used above is called the custom format. In C#, we have a few types of custom formats which we can to format the numbers, Such as zero placeholder – {0:00.00}, or digit placeholder {0:(#).##}, or percentage {0:0%}

Add Digits before decimal point using String.Format

If you want a specific number of digits before the decimal point, use zeros N-times before the decimal point.

For example. the code below ensures that there will always be three digits before the decimal point.

• Console.Write(String.Format("{0:000.0}", 123.456));
• Console.Write(String.Format("{0:000.0}", 12.3456));
• Console.Write(String.Format("{0:000.0}", 1.23456));
• Console.Write(String.Format("{0:000.0}", -1.23456));

Output

123.5
012.3
001.2
-001.2

Removing leading zero using String.Format

To format a decimal number without a leading zero, simply use # before the decimal point in your custom format.

• Console.Write(String.Format("{0:00.00}", 0.12)); // with leading zero
• Console.Write(String.Format("{0:00.#}", 0.12)); // without leading zero

Output

0.12
.12

Adding thousands separator using String.Format

Use zero and comma separator if you need to format a number to the string while placing the thousands separator.

• Console.Write(String.Format("{0:0,0.0}", 10000.00));

Output

10,000.0

Adding parenthesizes to negative Decimal using String.Format

The semicolon operator is used to create a custom formatting which separates positive, negative numbers and zeros.

• String.Format("{0:0.00;minus 0.00;zero}", -123.45);
• String.Format("{0: #, ##0.00; (#,##0.00)} ", -123.45);

Output

minus 123.45
(123.45)