Conversion To Double & Character

Question

When I used this conversion for double , it gives an error.
c=Convert.ToDouble(Console.Readline());
While I tried same syntax for user input as of string,it shows an error
d=Console.ReadLine();
Then I tried below one , still it gives an error message
d=Convert.ToCharacter(Console.Readline());

Answer 1

Console.ReadLine(); ... Line has a capital L