There are several key signatures that contain sharps.
A sharp key signature is one that contains sharps.
Go up a half-step from the last sharp in the key signature.
D major has a key signature of F sharp and C sharp D minor has a key signature of B flat
G sharp
G sharp
There is no key signature that has Bb and C#.
The last sharp in the signature is one half-step below the key's tonic.
No key signature has two of the same flat or sharp.
The key signature indicates which notes are sharp, natural, or flat. Every key has a specific signature.
E sharp minor
The key signature for D sharp minor would be the one for F sharp major: FCGDAE. You can also think of it as E flat minorwhich is related to g flat major in which the key signature would be BEADGC.
C# Major