C# -- General Questions and Answers:
Part-II
1)
Is it
possible to use Keychar value in Keyup Event?
Yes, Use Keyvalue.
Code
if (e.KeyValue == 13)
{
MessageBox.Show("Press Enter Key");
}
22)
Difference
between Form_loading and Form_activated?
Load: This event occurs
before a form is displayed for the first time.
Activated: This event occurs
when the form is activated in code or by the user.
33)
What are
the Keywords apply to event?
Keywords
for Event: Static, Virtual, Sealed and
Abstract.
44)
Which is
a basis for event?
Events:
Form_Load, Click, Got_Focus (), Set_Focus(),Activate(),Form_Close()
55)
Where to
use default keyword?
The
default keyword is contextual since it has multiple
usages. I am guessing that you are referring to its newer C# 2 meaning in which
it returns a type's default value. For reference types this is null and for
value types this new instance all zero'd out.
66)
Is it possible
to change the const keyword object?
No, you
will get this error "The left-hand side of an assignment must be a
variable, property or indexer".
77)
Is static
modifier allowed in a Constant Declaration? Why?
No,
Static and const are not the same thing. Static means that you do not
instantiate a class object in memory to use the static object. Static
objects can be changed.
Const means that you cannot change the value.
Const means that you cannot change the value.
88)
Is it
possible to use more catch statement in the Try catch statement?
Yes,
try
{
//try connect to db
}
catch (SqlException ex)
{
// information of database related
exception
}
catch (Exception ex)
{
// catch any other error
}
99)
What is
the default value of bool value?
Boolean default is false
110)
How to
stop long Thread?
Use Thread. Stop ();
111)
Which
namespace has Threading?
Namespace
of Threading is System. Threading;
112)
How to
get Default value in C#.net?
Use Default Keyword.
113)
When are
validating and validated events suppressed?
CausesValidation Property is false.
114)
Difference
between Double.Parse and Double.TryParse?
Parse throws an exception if it cannot parse
the valueTryParse returns a bool indicating whether it succeeded.
115)
What
method do you call on a delegate to run it on a background thread?
Invoke
Method.
116)
What
keyword provides thread synchronization?
Lock
Keyword.
117)
Where to
use Delegates in C#.net?
Delegates are used in the following cases:
·
Event handlers
·
Callbacks
·
LINQ
·
Implementation of design patterns.
http://zetcode.com/lang/csharp/delegates/