private void buttonbookingstatus_Click(object sender, EventArgs e)
 {
     if (textBox4.Text == string.Empty || textBox5.Text == string.Empty)
     {
         MessageBox.Show("All required must be fillup!");
     }
     else
     {
         EquipmentServices foodService = new EquipmentServices();
         int result = foodService.Insert(new Food()
         {
             Name = textBox5.Text, Cost = Convert.ToDouble(textBox4.Text)
         });
         if (result > 0)
         {
             MessageBox.Show("Food added.");
             UpdateGridView();
         }
         else
         {
             MessageBox.Show("Error");
         }
     }
 }