I have inside of string a hexadecimal value:

strHexa="045f456678eddfeadfe345629000a1001010e............

Its long is nerly to 4090 characters. This string update a hexadecimal fields in a table. When I need update this field using this string, its is converted in other value, of course, its is a string and not hexadecimal value. In the update moment this makes a converts to hexadecimal value. If I try convert this string to decimal, when had pass 200 characters occurs a overflow error, using a double, its value is over 1.79.....E+308. I think that using a Hexadecimal Variable, the update do not make a convert, and take this value, inside of the variable as hexadecimal value to upate.
Please. Are there some way to declarate a hexadecimal value. Or to converts from too long or bigger Hexadecimal to decimal value????
Thanks to all!!!!!!!!!!1
Bye
Juan Carlos Chacón