Conversion of integer to binary representation in C#

Converting integers to their binary representation is a common programming task. In C#, there are several ways to perform this transformation, including the ToInt32 and ToString methods of the Convert class.

To demonstrate this process, let's solve a problem encountered by a user who tries to convert integers represented as strings to their binary representation:

String input = "8";
String output = Convert.ToInt32(input, 2).ToString();

This code throws an exception with the message "No parsable number found". This is because ToInt32 expects the input string to represent a decimal integer, not a binary integer, and the string "8" represents a decimal value of 8.

To correctly convert an integer into its binary representation, we use the Convert.ToString method and specify the cardinality of 2. Here is an updated code snippet:

int value = 8;
string binary = Convert.ToString(value, 2);

This code converts the integer value (which has a decimal value of 8) into a string representing its binary representation, and the result is the string "1000".