How to convert an integer to hexadecimal and vice versa in C#?

Converting Integer to Hexadecimal

An integer can be converted to a hexadecimal by using the string.ToString() extension method.

Integer Value: 500
Hexadecimal Value: 1F4

Converting Hexadecimal to Integer −

A hexadecimal value can be converted to an integer using int.Parse or convert.ToInt32

int.Parse − Converts the string representation of a number to its 32-bit signed integer equivalent. A return value indicates whether the operation succeeded.

Hexadecimal Value: 1F4
Integer Value: 500

Convert.ToInt32 −Converts a specified value to a 32-bit signed integer.

Hexadecimal Value: 1F4
Integer Value: 500

Converting Integer to Hexadecimal −

string hexValue = integerValue.ToString("X");

Example

 Live Demo

using System;
namespace DemoApplication{
   public class Program{
      public static void Main(){
         int integerValue = 500;
         Console.WriteLine($"Integer Value: {integerValue}");
         string hexValue = integerValue.ToString("X");
         Console.WriteLine($"Hexadecimal Value: {hexValue}");
         Console.ReadLine();
      }
   }
}

Output

The output of the above code is

Integer Value: 500
Hexadecimal Value: 1F4

Converting Hexadecimal to Integer −

Example using int.Parse −

Example

 Live Demo

using System;
namespace DemoApplication{
   public class Program{
      public static void Main(){
         string hexValue = "1F4";
         Console.WriteLine($"Hexadecimal Value: {hexValue}");
         int integerValue = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);
         Console.WriteLine($"Integer Value: {integerValue}");
         Console.ReadLine();
      }
   }
}

Output

The output of the above code is

Hexadecimal Value: 1F4
Integer Value: 500

Example using Convert.ToInt32 −

Example

 Live Demo

using System;
namespace DemoApplication{
   public class Program{
      public static void Main(){
         string hexValue = "1F4";
         Console.WriteLine($"Hexadecimal Value: {hexValue}");
         int integerValue = Convert.ToInt32(hexValue, 16);
         Console.WriteLine($"Integer Value: {integerValue}");
         Console.ReadLine();
      }
   }
}

Output

The output of the above code is

Hexadecimal Value: 1F4
Integer Value: 500