How do I make 2 brackets appear instaed of 1

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C#

so im coding and this happens

as you can see below "Main" has 2 regular brackets while "Add" doesnot, for some reason when ever im in Add and press shift + "{" only 1 bracket forms instaed of 2 which is annoying since it prevents me from declaring a body. so how do i fix this

What I have tried:

namespace Aiwi
{
    class Program
    {
        static void Main()
        {

        }

        public int Add(int Fn, int Sn);
        {
        
    }
}