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Name 3 dialog box classes provided by VB. What is the datatype returned by using the...

Name 3 dialog box classes provided by VB. What is the datatype returned by using the showdialog method.

What is the difference between using ByVal and ByRef in parameter passing and which is done in java

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Answer #1

Dialog box provided by VB:

1) ColorDialog: ColorDialog class provides dialog box to select colors and some controls to select color. It returns a Color class object.

2) OpenFileDialog: It allows the user to select a file to open. It is inherited from FileDialog abstract class.

3) SaveFileDialog: It allows the user to select the location to save the file. It is inherited from FileDialog abstract class.

ByVal ByRef
It sends sends a copy of the parameter(s) to the procedure. It sends a reference of the parameter(s) i.e., the location at which the value is stored in memory.
Any changes made in the formal parameter of the procedure definition will not reflect in the actual parameter of procedure call.   Any changes made in the formal parameter of the procedure definition will reflect in the actual parameter of procedure call.

Syntax:

Public Sub procedureName(ByVal variableName DataType)

Syntax:

Public Sub procedureName(ByRef variableName DataType)
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