Difference between listbox and combo box?
A LISTBOX CONTROL displays a list of items from which the user can select one or more. If the number of items exceeds the number that can be displayed, a scroll... Read more »
‘Visual Basic Interview Questions’ - KyaPoocha.com
Difference between Dynaset and Snapshot?
All Recordset objects are constructed using records (rows) and fields (columns). There are five types of Recordset objects: Table-type Recordset :: representation... Read more »
Difference Listindex and Tab index?
LIST INDEX:: Returns or sets theindex of the currently selected item in the control. Not available at design time.Default LIST INDEX IS -1 for ComboBox, DirListBox,... Read more »
Difference modal and moduless window?
MODAL forms are forms which require user input before any other actions can be taken place. In other words, a modal form has exclusive focus in that application... Read more »
Difference Object and Class?
Classes and objects are separate but related concepts. Every object belongs to a class and every class contains one or more related objects. 1)A Class is static.... Read more »
Difference Query unload and unload in form?
Occurs before a form or application closes. When an MDIForm object closes, the QueryUnload event occurs first for the MDI form and then in all MDI child forms. If... Read more »
Difference Declaration and Instantiation an object?
Dim obj as OBJ.CLASS with either Set obj = New OBJ.CLASS or Set obj = CreateObject(?OBJ.CLASS?) or Set obj = GetObject( ,? OBJ.CLASS?) or Dim obj as New OBJ.CLASS Set... Read more »
Version |Year |Significant Changes and New Features of Visual Basic?
1 1991 initial release, with drag and drop GUI creation 2 1992 ODBC, object variables 3 1993 Access Engine, OLE 2.0, Crystal Reports, new tools and controls 4 1995... Read more »
How can objects on different threads communicate with one another?
Processes communicate with one another through messages, using Microsoft’s Remote Procedure Call (RPC) technology to pass information to one another. There is... Read more »
How can you force new objects to be created on new threads?
The CreateThread function creates a thread to execute within the virtual address space of the calling process. To create a thread that runs in the virtual address... Read more »
How does a DCOM component know where to instantiate itself?
To create a remote instance of a script component, call the CreateObject method, passing it the name of the remote computer as a parameter. If the remotable attribute... Read more »
What type of multi-threading does VB6 implement?
Apartment model threading Read more »
How to register a component?
Compiling the component, running REGSVR32 MyDLL.dll What is Database Connection pooling (relative to MTS) This allows MTS to reuse database connections. Database... Read more »
What is the tool used to configure the port range and protocols for DCOM communications?
DCOMCONFIG.EXE Read more »
What is a Type Library and what is it’s purpose ?
The type library may represent another Visual Basic project, or any other executable component that exposes a type library. Visual Basic creates type library information... Read more »
What are binary and project compatibility?
Visual Basic’s Version Compatibility feature is a way of enhancing your components while maintaining backward compatibility with programs that were compiled using... Read more »
How to set a shortcut key for label?
object.KeyLabel(keycode) [= string] You would probably create the menu item as follows: .Add “keyFile”, , , “E&xit”, , vbAltMask + vbCtrlMask, vbKeyEnd The... Read more »
Name the four different cursor and locking types in ADO and describe them briefly ?
CURSORS:: The cursor types are listed from least to most resource intensive. Forward Only - Fastest, can only move forward in recordset Static - Can move to any... Read more »
Name the different compatibility types when creating a COM component.
No Compatibility - New GUID (Globally Unique Identifier) created, references from other components will not work Project Compatibility - Default for a new component Binary... Read more »
List the ADO objects?
Connection - Connects to a data source; contains the Errors collection Command - Executes commands to the data source. The only object that can accept parameters... Read more »