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How can we Move to Next and Previous Record using BindingSource Class

Posted By :Lakhan Pal Garg     Posted Date :May 03, 2010    Points :10   Category :VB.Net 
bindingSource1.MoveNext() to move to Next record and
bindingSource1.MovePrevious() to move to previous record.

You can also find related Interview Question to How can we Move to Next and Previous Record using BindingSource Class  below: 

How can we find the index of current selection in BindingSource Class?

Using bindingSource1.Position we can find the index of currently selected item.
Here bindingSource1 is the object of BindingSource Class. (More...)

What is the difference between a Struct and a Class?

The struct type is suitable for representing lightweight objects such as Point, Rectangle, and Color. Although it is possible to represent a point as a class, a struct is more efficient in some scenarios. For example, if you declare an array of 1000 Point objects, you will allocate additional memory for referencing each object. In this case, the struct is less expensive.

When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized.

It is an error to declare a default (parameterless) constructor for a struct. A default constructor is always provided to initialize the struct members to their default values.

It is an error to initialize an instance field in a struct.

There is no inheritance for structs as there is for classes. A struct cannot inherit from another struct or class, and it cannot be the base of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do.

A struct is a value type, while a class is a reference type. (More...)

Can we call a base class method without creating instance?

Its possible If its a static method.

Its possible by inheriting from that class also.

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What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

What is the difference between interface and abstract class ?

a class may inherit several interfaces, a class may inherit only one abstract class (More...)

Differentiate between a template class and class template.

Template class:
A generic definition or a parameterized class not instantiated until the client provides the needed information. It's jargon for plain templates.

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What is an adaptor class or Wrapper class?

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What is class invariant?

A class invariant is a condition that defines all valid states for an object. It is a logical condition to ensure the correct working of a class. Class invariants must hold when an object is created, and they must be preserved under all operations of the class. In particular all class invariants are both preconditions and post-conditions for all operations or member functions of the class. (More...)

What are the conditions that have to be met for a condition to be an invariant of the class?

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