FormatException: Could not find any recognizable digits

Question

I get this exception:

A first chance exception of type 'System.FormatException' occurred in mscorlib.dll

At this line:

String value = "2";
uint? test = Convert.ToUInt32(value, 2);

Answer 1

That's because your second parameter sets the base to 2, and 2 is not a valid digit in binary.

From MSDN

The call to public static uint ToUInt32(string value, int fromBase) will throw a FormatException when value contains a character that is not a valid digit in the base specified by fromBase. The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.