System.Windows.Forms.d中发生了类型为'System.ObjectDisposedException'的未处理异常

Question

I am working with visual studio 2012 C# windows form application. I am simply setting up my flow of forms by button_click events ie form1 has a button Click Next which will close current form and open a new form Form2. Form2 has a "Click Next" Button which takes to Form3 and so on. In my forms, I am using form1.show() and form1.close() at required places. Please, look into this and replies are welcome.I am facing an Exception as An unhandled exception of type 'System.ObjectDisposedException' occurred in System.Windows.Forms.dll Additional information: Cannot access a disposed object.
MY program.cs is here

namespace WindowsFormsApplication1
{
    static class Program
    {

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Validate_Form());



        }
    }
}

Answer 1

In a Winform application, the window you specify in the Main method is your application's Main Form which gets associated with your Application's Process Handler in the OS (Windows). Processes can be categorized in 2 types. Windowed processes and Windowless ones. In a Windowed process, all the other forms in your application which are mapped to a Windows Window object will be a direct or indirect child of the main form of the application. If you are designing a wizard as it looks it is what your are doing, my suggestion is to have your main form as a container and have the steps of the wizard as children gets loaded into your main form. For instance, you have a 2 step wizard: in this scenario, you will be needing 3 forms; the main form and the 2 steps. Main form will have the title and on the bottom area the navigation/control buttons (next/finish/cancel) and in the middle part of the form insert a container which loads the 2 steps. you need to set the properties of the steps as Window = none and ChildWindow = true. Now, when you load the main form, it loads the step 1 into its container area by setting the right child/parent relation in the main form's container object. Once user clicks on next, then you load the second form, hide the first one, and activate the second one. I think you got the idea. And this is how an actual wizard is designed. Let me know if you had any other questions/concerns.