Convert 16 bit signed integer

using System;
using System.Text;
//Write a program that shows the binary representation of given 16-bit signed integer number
class SignedShortToBinary
{
    static void Main()
    {
        Console.WriteLine("Enter 16-bit signed integer number: ");
        short convert = short.Parse(Console.ReadLine());

        StringBuilder builder = new StringBuilder();
        string result = "";

        if (convert < 0)
        {
            short temp;
            temp = ((short)(Math.Pow(2, 15) - convert));

            for (int i = 0; i < 14; i++)
            {
                if ((temp & 1) == 1)
                {
                    builder.Insert(0, 1);
                }
                else
                {
                    builder.Insert(0, 0);
                }
                temp /= 2;
            }
            builder.Insert(0, 1);
            result = builder.ToString();
        }
        else
        {
            while (convert > 0)
            {
                if ((convert & 1) == 1)
                {
                    builder.Insert(0, 1);
                }
                else
                {
                    builder.Insert(0, 0);
                }
                convert /= 2;
            }
            result = builder.ToString();
        }
        Console.WriteLine("Binary representation: \n{0}",result);
    }
}