Databases
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    <p>It's not allowed to inherit from two base classes. You can only inherit from one class but implement in addition as many interfaces as you want. Try like this:</p> <pre><code>public ref class Form2 : public Form1 { </code></pre> <p>In your case you do not need to inherit from two classes because Form1 already inherits System.Windows.Forms.Form and if Form2 inherits Form1 it's also automatically of the type System.Windows.Forms.Form.</p> <p>If it's just one variable that both forms should have in common and nothing else, why do you want to use inheritance? Because inheritance means in general to extend the base class so that ALL members/properties/methods of Form1 are also available in Form2. Because the forms must inherit from System.Windows.Forms.Form you cannot use any other base class. Perhaps you should think about using a common Interface that defines the common variable as a property and then, both forms have to implement that interface.</p> <pre><code>public interface IMyForm { int MyValue { get; set; } } public class Form1 : System.Windows.Forms.Form, IMyForm { public int MyValue { get; set; } ... } public class Form2 : System.Windows.Forms.Form, IMyForm { public int MyValue { get; set; } ... } </code></pre> <p>Sorry for the C# syntax, hope it becomes clear what I mean. If you have now a method that expects a form with that common property as a parameter for example you can simple do that:</p> <pre><code>public void DoSomething(IMyForm form) { form.MyValue = 5; } </code></pre> <p>And you can pass an instance of Form1 or Form2 as the parameter.</p>
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    1. POHow to inherit variables from between forms in Visual Studio, C++
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    1. USTorben Schramme
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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