// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
 public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 {
     if (env.IsDevelopment())
     {
         app.UseDeveloperExceptionPage();
     }
     using (var context = new CoordinatesContext())
     {
         context.Database.EnsureDeleted();
         context.Database.EnsureCreated();
     }
     app.UseDefaultFiles();
     app.UseStaticFiles();
     app.UseRouting();
     app.UseEndpoints(endpoints =>
     {
         endpoints.MapHub <WhiteboardHub>("/draw");
     });
 }
 public WhiteboardHub(CoordinatesContext _context)
 {
     this.dbcontext = _context;
 }