# How to: Convert Hexadecimal Strings to Numbers (Visual Basic)

This example converts a hexadecimal string to an integer using the Convert.ToInt32 method.

## To convert a hexadecimal string to a number

• Use the ToInt32(String, Int32) method to convert the number expressed in base-16 to an integer.

The first argument of the ToInt32(String, Int32) method is the string to convert. The second argument describes what base the number is expressed in; hexadecimal is base 16.

' Assign the value 49153 to i.
Dim i As Integer = Convert.ToInt32("c001", 16)

• Note that the hexadecimal string has the following restrictions:

• It cannot include the &h prefix.
• It cannot include the _ digit separator.

If the prefix or a digit separator is present, the call to the ToInt32(String, Int32) method throws a FormatException.