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Difference between Dynamic polymorphism and static polymorphism

In static polymorphism response to a function is decided at compile time. In Dynamic polymorphism response to a function is decided at run time. 1)Static polymorphism is achieved by method overloading where as run time polymorphism( or dynamic polymorphism) is achieved by method overriding. 2)static polymorphism uses the concept of compile time binding(or early binding) where as dynamic polymorphism uses the concept of runtime binding (or late binding). 3)Dynamic polymorphism is faster than static polymorphism. 4)To implement static polymorphism inheritance is not necessary where as to implement dynamic polymorphism inheritance is necessary. 5)Generally when a programmer want to extend existing feature in a software,method overloading(load + extra load(more lines of code)) is used,and a programmer uses method overriding when he wants to provide a different implementation for the sa

Explain polymorphism?

polymorphism poly+morphos=many forms poly means "many" morphos means "forms".polymorphism allows one interface to be used for many functions. In static polymorphism response to a function is decided at compile time. In Dynamic polymorphism response to a function is decided at run time. 1)Static polymorphism is achieved by method overloading where as run time polymorphism( or dynamic polymorphism) is achieved by method overriding. 2)static polymorphism uses the concept of compile time binding(or early binding) where as dynamic polymorphism uses the concept of runtime binding (or late binding). 3)Dynamic polymorphism is faster than static polymorphism. 4)To implement static polymorphism inheritance is not necessary where as to implement dynamic polymorphism inheritance is necessary. 5)Generally when a programmer want to extend existing feature in a software,method overloading(load + extra load(more lines of code)) is used,and a programmer uses method overriding when he wants to provide a different implementation for the same feature.

Define virtual keyword?

when a method or property in a parent class need to be overridden in the child class,it should be declared as virtual in parent class and can be overridden in child class using override keyword. Now we should discuss about static polymorphism and dynamic polymorphism :)

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Explain Asp.net Page Directives

Why State Management ?

In traditional web programming information associated with the web page and with controls of page will be lost between post-backs.

Ex:-when user enters some text in text box (or) mark a check-box (or) selected an item in combo-box,that information(changes) will be lost in the round trip from client/browser to server.

To overcome this Asp.net Introduced severel methods to store data on the client-browser/server and retrieve from client-browser/server.

• View State
• Control State
• Hidden Fields
• Cookies
• Query Strings
• Application State
• Session State

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Asp.net useful Tips

1)Use informative  ALT attribute for every graphical representation(PNG files,JPEG files) to show who cant view these graphical representations.

Difference between Dispaly:none and Visibility:hidden

Display : None    Removes the element completely from the document without taking any space eventhough HTML for it still  remains in the source code.

Visibility : Hidden  Hides the element but it still takes up space in the document therefore affecting the layout.

Difference between APP_Code & APP_Data folders in ASP.Net ?

• App_code folder contains all .cs/.vb files and they will compile automatically when ever you change anything in the files within.  code present in App_code folder is automatically referenced by asp.net web application.
• App_data folder is used to store files that can be used as database files(.mdf/xml files) .It will be created automatically when a new website is created.Developers use this folder for storing database used by Asp.net application.

Explain Asp.net Page Directives

Does dotnet support multiple inheritance?

• c# and vb does not support multiple inheritance.
• They supports only multiple interface inheritance.

How to delete duplicate rows from tables with no primary key!

Ans) Use SET ROWCOUNT value

Ex:-     SET ROWCOUNT 2
           DELETE FROM table_name WHERE somecolumn1=somecolumnvalue
           SET ROWCOUNT 0

         Imagine a table having 3 similar rows.The above delete statement executes 2 times deleting the extra 2 rows.Dont forget to set ROWCOUNT to 0 after succesfull query execution.

Explain OOPS Concepts

INDEX Statement

• Indexes are used to search/query the data from the table, without reading the entire table.

Advantages:-

1. Allows the application to find the data fast from database thereby increasing the query speed.

DROP,DELETE & TRUNCATE

DROP:- Tables,Databases,Indexes can be easily removed using DROP Statement.
           
EX:-DROP TABLE table-name
                 Deletes table completely from database.

 similarly DROP INDEX index-name
              DROP DATABASE database-name