Question Script Declaring Variable

Hello, is it possible in CSharp to make the script declare himself variable ?
Like a thing like that :

Code (CSharp):

1. Script.Declare(int variableName = 4);

?
If it exist thank for tell me how.
Thank to feed back...

 

For solve that problem but it is another one, it is possible to declare a variable with in his name the value of another variable ? (Like that)

Code (CSharp):

1. int value = 3;
2. int "Number" + value + "variable" = 10;

Like if the int name was a string.
Thank you for answer...