collections in c#( dictionary with the names of the country)

Question

Create dictionary with the names of the country

"de", "Germany";
"sk", "Slovakia";
"us","united states";
"ru","russia";
"hu","hungary";
"pl","poland";

a)display the names of the countries with the key values "hu" and "sk"
b)print the number of items in the dictionary
c)display all the keys in the dictionary
d)display all the values in the dictionary
e)display all the values and keys in the dictionary