Timothy

using System;
using System.Runtime.InteropServices;
namespace InstallMyFontExample 
{
    class Program {
        [DllImport("gdi32", EntryPoint = "AddFontResource")]   
        public static extern int AddFontResourceA(string lpFileName);   
        [DllImport("gdi32", EntryPoint = "RemoveFontResource")] 
        public static extern int RemoveFontResourceA(string lpFileName); 
        
        static void Main(string[] args) 
        { 
            int result = -1; result = RemoveFontResourceA(@"C:\MY_FONT_LOCATION\MY_NEW_FONT.TTF");
            Console.WriteLine((result == 0) ? "Font was not found." : "Font removed successfully.");
            result = AddFontResourceA(@"C:\MY_FONT_LOCATION\MY_NEW_FONT.TTF");
            Console.WriteLine((result == 0) ? "Font is already installed." : "Font installed successfully."); Console.ReadKey(); 
        } 
    } 
}