# Converting Numbers Between Bases in .NET

I was goofing off last night when I was waiting for my wife to get out of class and came up with BaseMaster. BaseMaster is a simple online base conversion utility that takes a (valid) number from one base and converts it to another.

It turns out that converting numbers between bases is extremely easy in .NET. Microsoft was nice enough to overload the `Convert.ToInt64(num, base)`

method to allow conversions to base 10. Conversely, the `Convert.ToString(num, base)`

medhod will convert a base 10 number to a specified base. The only catch is that the bases have to be `2, 8, 10, or 16`

These two methods allow a pretty easy conversion method to be written that will handle all of the conversions I'm interested in.

public static string Convert(string num, int fromBase, int toBase) { string result = ""; try { long decValue = System.Convert.ToInt64(num, fromBase); result = System.Convert.ToString(decValue, toBase); } catch (System.Exception) { result = "ERR"; } return result.ToUpper(); }

The key here is to convert the user-input number to base 10 and then convert the base 10 number to the desired base. This way you don't have to worry about catching every special case where a user would want to convert from one base to another.

Also, a `System.FormatException`

will get thrown if the input number has invalid characters for it, so you should keep that in mind if you ever need to do something similar.

The remaining source code can be found on Github and is released under the Open Source Public License.

BaseMaster is free to use and enjoy.