In what sequences can multiple catch exception handling blocks be placed?

In C#, catch blocks must be ordered from more specific exceptions to more general ones. This is because if a handler for the base exception class is placed first, the more specific blocks will simply not be reached.

For example:

try
{
    // Code that may throw exceptions
}
catch (FileNotFoundException ex)
{
    // Handling specific exception
}
catch (IOException ex)
{
    // Handling more general exception
}
catch (Exception ex)
{
    // Handling all other exceptions
}

If you change the order and place catch (Exception ex) first, the other blocks will become unreachable, and the compiler will generate an error.