Convert binary numbers to hex

using System;
using System.Text;
//Write a program to convert binary numbers to hexadecimal numbers (directly)
namespace practice
{
    class ConvertToBynary
    {
        static void Main()
        {
            Console.WriteLine("Enter decimal number : ");
            int convert = int.Parse(Console.ReadLine());
            StringBuilder builder = new StringBuilder();

            while (convert > 0)
            {
                if (convert%16 > 9)
                {
                    switch (convert%16)
                    {
                        case 10: builder.Insert(0, 'A'); break;
                        case 11: builder.Insert(0, 'B'); break;
                        case 12: builder.Insert(0, 'C'); break;
                        case 13: builder.Insert(0, 'D'); break;
                        case 14: builder.Insert(0, 'E'); break;
                        case 15: builder.Insert(0, 'F'); break;
                    }
                }
                else
                {
                    builder.Insert(0, convert % 16);
                }
                convert /= 16;
            }

            Console.WriteLine("Converted number : \n{0}", builder.ToString());
        }
    }
}