How to Convert Between Decimal and Hexadecimal Numbers in C#?

Hexadecimal and decimal number conversion in C#

In programming, it is often necessary to convert numbers between different bases. A common conversion is between hexadecimal (base 16) and decimal (base 10). Here's how to perform this conversion in C#:

Convert decimal to hexadecimal

To convert a decimal number to its hexadecimal representation, use the ToString("X") method:

<code class="language-csharp">string hexValue = decimalValue.ToString("X");</code>

This converts decimalValue to a hexadecimal string, where each number represents a value from 0 to 15 (for values ​​10-15, use A-F).

Convert hexadecimal to decimal

To convert a hexadecimal number to a decimal number, there are two methods:

1. Use int.Parse():

<code class="language-csharp">int decimalValue = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);</code>

This method parses the hexValue string into a hexadecimal number and returns an integer value.

2. Use Convert.ToInt32():

<code class="language-csharp">int decimalValue = Convert.ToInt32(hexValue, 16);</code>

This method is equivalent to the above method, but uses the Convert class to perform the conversion. The second parameter specifies base 16 for hexadecimal conversion.

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