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I have this doubt "where do they exist in VB ??? where are the methods used in Interface come from ?? is it the same as class modules methods ?? If not then what methods would QueryInterface return ?? "
Please Clear my doubt anyone !">Hi ! In VB the term Interface and the Interfaces reffered say IDispatch, IUnknown are explained conceptually. In reality i.e., in coding concepts where does this Interface exists? Interfaces are used in COM, while using this COM objects (ACTX EXE, DLL,CTRL) class modules need to be declared and reffered. Though the Interface concepts says " Interface are not classes, they cannot be instantiated ..." I have this doubt "where do they exist in VB ??? where are the methods used in Interface come from ?? is it the same as class modules methods ?? If not then what methods would QueryInterface return ?? "Please Clear my doubt anyone !
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What is the size of the variant data type?
The Variant data type has a numeric storage size of 16 bytes and can contain data up to the range of a Decimal, or a character storage size of 22 bytes (plus string length), and can store any character text.
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What is the diff between RDO and ADO?
RDO is Hierarchy model where as ADO is Object model. ADO can access data from both flat files as well as the data bases. I.e., It is encapsulation of DAO, RDO , OLE that is why we call it as OLE-DB Technology.
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List out controls which doest not have events
Line and shape controls
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Dim x, y as integer. What is x and y data type?
X as variant and y as integer.
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Calling Stored Procedures in VB?
1. Calling Simply the Procedure with out Arguments "Call ProcedureName}" 2. If it is with Arguments Means then Declare the Query Def qy Set Qy as New Query def Qy.SQL = "{Call ProcedureName(?
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Visual Basic Interview Questions
Ans