Too much code in main function about simple-stock

[MasterOfAllEvil]

I am thinking

 int Selection<T>(List _menu){
   int counter = 0;
   foreach(T option){
   Console.WriteLine(++counter + "). " + option.ToString());
}
   return Int16.Parse(Console.ReadLine());
} 
}

T DataEntry<T> (string[] prompt){
foreach(string pro in prompt){
Console.WriteLine(prompt);
string input = Console.ReadLine();
if(T == DateTime)
// and so on
}

This reduces the code blocks to

if(input == "add"){
Stock stock = DataEntry<Stock>(["Name:", "Token:"]);
primary.addStock(stock);
}
if(input == "remove"){
int stockToRemove = Selection<Stock>(primary.stock);
primary.removeStock(stockToRemove);
}

}