Forum Moderators: coopster
The "double" data type (as with all numeric data types) is for storing a value only - it does not maintain any other characters that go with that value as far as your application is concerned, such a dollar sign or percentage.
If you actually want to see the percentage sign in your database you would need to use a character data type, such as varchar.
It is best stored as a numeric type (like you are using), and just have your application render the percent symbol whereever you display the number.