DDL: dynamic link library
Cache is stored in RAM
IL: Intermediate Language
Delegate: delegate is a pointer to a function
public int
Ramiz_SavePack(IPacking pack)
{
using (var conn =
(SqlConnection)connector.GetConnection())
{
conn.Open();
SqlTransaction transaction;
var comm =
(SqlCommand)connector.GetCommand("Ramiz_Pack_Save");
comm.CommandType =
CommandType.StoredProcedure;
transaction =
conn.BeginTransaction();
comm.Transaction = transaction;
int rowNum = 0;
try
{
if (!string.IsNullOrEmpty(pack.BrojKolete))
comm.Parameters.Add("@BrojKolete", SqlDbType.NVarChar).Value =
pack.BrojKolete;
else
comm.Parameters.Add("@BrojKolete", SqlDbType.NVarChar).Value =
DBNull.Value;
comm.Parameters.Add("@Bosanski",
SqlDbType.NVarChar).Value = pack.Bosanski;
comm.Parameters.Add("@Kom", SqlDbType.Float).Value = pack.Kom;
comm.Parameters.Add("@Vrsta", SqlDbType.NVarChar).Value =
pack.Vrsta;
comm.Parameters.Add("@Datum",
SqlDbType.Date).Value = pack.Datum;
comm.Parameters.Add("@BrojKamiona", SqlDbType.Int).Value =
pack.BrojKamiona;
rowNum =
comm.ExecuteNonQuery();
transaction.Commit();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
try
{
conn.Close();
transaction.Rollback();
}
catch (Exception ex2)
{
Console.WriteLine(ex2.Message);
}
}
return rowNum;
}
}
Virtual Keyword: Virtual is here give permission to
its child class to go ahead and overwrite.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
test objclass = new overtest();
objclass.show();
}
}
class test
{
public virtual void show()
{
Console.WriteLine("base class");
}
}
class overtest :test
{
public override void show()
{
Console.WriteLine("child class");
}
}
}
Output : child class
What is the
use of shadowing in c#?
https://www.youtube.com/watch?v=xmjOPCnSE30
Shadowing means basically parents elements (i) is completely
replaced by child elements in terms of data (variable, method or functions)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
class1 obj1 = new class1();
class2 obj2 = new class2();
obj1.i = 123;
obj2.i();
}
}
public class class1
{
public int i;
}
public class class2: class1
{
public void i()
{
}
}
}
Static keyword
Static
Classes and class members are used to create data and methods that can be
accessed without creating an instance of the Class. The keyword Static can be
applied to the Classes, field, method, properties, operator, event and
constructors.
Class products
{
Public static int price;
Public
static void showinfo();
}
We can call variables and methods of
static classes without creating an instance of the class. That means you cannot
use the new keyword to create a variable of the class type. We can call static
members and methods directly from classes like the following:
Product.price = 100;
Product.showInfo();
What is
delegates??
https://www.youtube.com/watch?v=ifbYA8hyvjc&t=340s
Delegates is a pointer to a function.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
class2 objcls = new class2();
objcls.numberlist(callback);
}
static void callback(int i)
{
Console.WriteLine(i);
}
}
public class class2
{
public delegate void callback(int i);
public void numberlist(callback obj) // Function
{
for (int i = 0; i < 1000; i++)
{
obj(i);
}
}
}
}
What is an Abstract Class?
An abstract class is a special
kind of class that cannot be instantiated. So the question is
why we need a class that cannot be instantiated? An abstract class is only to
be sub-classed (inherited from). In other words, it only allows other classes
to inherit from it but cannot be instantiated. The advantage is that it
enforces certain hierarchies for all the subclasses. In simple words, it is a
kind of contract that forces all the subclasses to carry on the same
hierarchies or standards.
What is an Interface?
An interface is not a class.
It is an entity that is defined by the word Interface. An interface has no
implementation; it only has the signature or in other words, just the
definition of the methods without the body. As one of the
similarities to Abstract class, it is a contract that is used to define
hierarchies for all subclasses or it defines specific set of methods and their
arguments. The main difference between them is that a class can implement more
than one interface but can only inherit from one abstract class. Since C# doesn’t support multiple inheritance,
interfaces are used to implement multiple inheritance.
GC - Garbage Collector –
Feature provided by CLR to clean up unused managed objects
Managed and
Unmanaged Code –
Anything which is within boundary of CLR is called managed
code, Outside boundary of CLR is called Unmanaged code
C#
Out parameters Vs REF parameters
Out and Ref are c# keywords which helps you to pass variables
data to function and methods by reference.
Ref parameter:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
int val = 10;
calculate(ref val);
Console.WriteLine(val);
}
static void calculate(ref int val)
{
val = val + 1;
}
}
}
Output: 11
Out Parameter:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
int val = 10;
calculate(out val);
Console.WriteLine(val);
}
static void calculate(out int val)
{
val = 0;
val = val + 1;
}
}
}
Output: 1
Reflection
in .Net –
https://www.youtube.com/watch?v=y8-uq6Ur7Dc
Reflection is inspecting assembly metadata (.ddl) to find
out how many class this assembly have or how many method that particular class
have.
Early binding: Create Instance of class at compile time is
called Early binding
Late Binding : Create
Instance of class at run time is called late binding.
.Net Basic
Basic of .net
-
IL Code, CLR, CTS, code access security, Garbage
collector, global assembly cache, value type, reference type, boxing unboxing
Oops
-
Abstraction, encapsulation, polymorphism,
inheritance, what is difference between abstract class and interface. What is
shadowing.
SQL Server
-
Indexes, cluster indexes, non-cluster indexes,
normalization, denormalization
ADO.Net
-
Difference between Dataset, data reader,
different component in ADO.net like dataset, data reader, data adaptor, data
view, connection objects
Asp.net
-
ASP.net Page life cycle, post back, http handler,
http module, sessions variables, view state, how to do authentication, authorization
Web services
-
SOAP, REST, WSDL, what is asmx file and what is
the use of web services, OData
New
Technologies
WCF
-
What is operation contract, what is services
contract, what is end point, what is address, binding, contracts, what is the
difference between web services and wcf services.
WPF / Silverlight
-
What is XML file, what is different kind of
components which are available in Silverlight. How is the silver light framework,
why MVVM is good in WPF and Silverlight
LINQ / Entity framework – OR Maper
-
Why do we need LINQ, why do we need entity framework,
what is data contacts, what is object contact, how do you use stored procedure
in entity framework and LINQ. In what scenario LINQ is good, what scenario entity
framework is good.
Azure / cloud computing
-
Tables, queues, BLOB and all different azure
components which help you to do cloud computing.
WWF – work flow
-
Sequencing workflow, state machine workflow
Architecture
Design Patterns
-
Factory patterns, abstract factory patterns, singleton
and in what scenarios what are good.
MVC / MVP / MVVM
-
What is MVC(Model view controller), what is MVP(model
view presenter), what is MVVM(model view viewmodel) and in what scenario MVC is
better than MVP and when we should use MVVM,
UML Notations
-
How to write a use case, what is class diagram,
sequence diagram
Documentation
-
Different type of document available in
projects, technical document, how to write it, different section in technical
document.
Requirement to design
-
how does requirement document look like, how does
technical document look like.
Process
Agile
-
explain agile, how agile process looks like,
-
explain scrum
-
waterfall
-
SDLC process
Estimation Methodology
-
Function point analysis
-
Work breakdown structure
CMMI
SIX Sigma
What are generics
and what are generic collections?
How many types of collections are there in .net?
Array, Array List, hash table and specialize collections.
Array:
Strong point
Array are strong type so there is no boxing and unboxing, so
the performance is much better.
Week point
Fixed length
Array list & Hash
table
Strong point:
Resizable
Week point
They take only object, so there is lots of boxing and
unboxing
We needed something strong type as well as resizable, that’s
the reason we use generics.
In general : Generics collections
helps us to create flexible strong type collection, In Other word, Remove
Datatype from Logic is called Generic.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
bool check;
calcul<Int32> objcla = new calcul<Int32>();
check = objcla.calculate(1, 2);
Console.WriteLine(check);
calcul<String> objcla1 = new calcul<String>();
check = objcla1.calculate("Raj","Raj");
Console.WriteLine(check);
}
}
class calcul<CHECKTYPE>
{
public bool calculate(CHECKTYPE x, CHECKTYPE y)
{
if (x.Equals(y))
{
return true;
}
else
{
return false;
}
}
}
}
Difference
Between “==” and “. Equals ()”
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Interview
{
class Program
{
static void Main(string[] args)
{
//object o = ".Net Interview Questions"; //Instance o
//object o1 = o; // Reference of o is passed to o1, so reference is same //for o
and o1, also content are same.
object o = ".Net Interview Questions"; // Instance o
object o1 = new string(".Net Interview Questions".ToCharArray());
// new reference is created for o1
Console.WriteLine(o == o1); // Comparing Reference
Type
Console.WriteLine(o.Equals(o1)); // Comparing Content
}
}
}
Output:
False
True
Note: if your datatype is string, it always does content comparison.
What is GAC?
GAC: Global Assembly cache
GAC have strong named assembly, assemblies in the GAC can be
shared by all applications running on the machine without having copy in local
projects.
Example :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
here System, is assembly in GAC, you don’t need to add every
time to project, they come by default.
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