//above public form2 we need to put
Dictionary<int, Car<string, string, string>> car;
public Form2(Dictionary<int, Car<string, string, string>> car) // for examle using dictionary and class form form 1 in form 2
{
InitializeComponent();
this.car = car;
}
//in form 1 we need to add this for it to work
Form2 form = new Form2(car);
//by iq18but18cm