String format for Double in C#

Use the static method String.Format in C# to form a double string format.

For three decimal places -

String.Format("{0:0.000}", 987.383);
String.Format("{0:0.000}", 987.38);
String.Format("{0:0.000}", 987.7899);

For thousands separator -

String.Format("{0:0,0.0}", 54567.46);
String.Format("{0:0,0}", 54567.46);

Format string -

Example

using System;

class Demo {

   public static void Main(String[] args) {
      Console.WriteLine("Three decimal places...");
   
      Console.WriteLine( String.Format("{0:0.000}", 987.383));
      Console.WriteLine( String.Format("{0:0.000}", 987.38));
      Console.WriteLine(String.Format("{0:0.000}", 987.7899));
   
      Console.WriteLine("Thousands Separator...");
      Console.WriteLine(String.Format("{0:0,0.0}", 54567.46));
      Console.WriteLine(String.Format("{0:0,0}", 54567.46));
   }
}

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