How to Convert Hexadecimal values To/From Integers in C# and .NET?

Here are some simple functions that show how to convert HEX string values into various C# numeric data types (and vice versa):

using System.Globalization;

long hextolong(string hexValue)

return long.Parse(hexValue, NumberStyles.AllowHexSpecifier);

int hextoint(string hexValue)

return int.Parse(hexValue, NumberStyles.AllowHexSpecifier);

string inttohex( int intValue )

return intValue.ToString("X");

string longtohex( long longValue )

return longValue.ToString("X");

}
If you need zero padding for your HEX values you can use this notation:
To produce 2 character zero padding (like 01 or 0A) use:

string inttohex( int intValue )

return intValue.ToString("X2");

}
To produce 4 characters zero padding (like 00A1 or 0A04) use:
string inttohex( int intValue )
{
return intValue.ToString("X4");
}