private void button1_Click(object sender, EventArgs e)
        {
            
            List<Food> iss = new List<Food> {
                new Food() {name = "a", price = "1"},
                new Food() {name = "b", price = "2"}
            };
            comboBox1.DataSource = iss;
            comboBox1.DisplayMember = "Name";
        }
        class Food
        {
            public string name { get; set; }
            public string price { get; set; }
        }
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