Write a C# application with the method isUnique that accepts a Dictionary from strings to strings as a parameter and returns true if no two keys map to the same value $($and false if any two or more keys do map to the same value$).$ The empty map is considered to be unique, so your method should return true if passed an empty map. For example, if the map contains the following key$/$value pairs, your method would true: $\{$Marty$=$Stepp, Stuart$=$Reges, Jessica$=$Miller, Rodney$=$Snyder, Hal$=$Perkins$\}.$ But calling it on the following map would return false, because of two mappings for Perkins and Reges: $\{$Kendrick$=$Perkins, Stuart$=$Reges, Jessica$=$Miller, Bruce$=$Reges, Hal$=$Perkins, Kim$=$Graves$\}.$