Use ToString() to format doubles : double Format « Data Type « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Data Type
3. double Format

using System; 
 
class MainClass { 
  public static void Main() { 
    double v = 17688.65849; 
    double v2 = 0.15; 
    int x = 21; 
  
    string str = v.ToString("F2"); 
    Console.WriteLine(str); 
 
    str = v.ToString("N5"); 
    Console.WriteLine(str); 
 
    str = v.ToString("e"); 
    Console.WriteLine(str); 
 
    str = v.ToString("r"); 
    Console.WriteLine(str); 
 
    str = v2.ToString("p"); 
    Console.WriteLine(str); 
 
    str = x.ToString("X"); 
    Console.WriteLine(str); 
 
    str = x.ToString("D12"); 
    Console.WriteLine(str); 
 
  } 
}

17688.66
17,688.65849
1.768866e+004
17688.65849
15.00 %
15
000000000021