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Tuesday, 11 July 2023
Accelerate Your Business with Expert ASP.NET MVC Application Development Services
Friday, 25 December 2020
ASP.NET Core Security
Overview:
Features:
ASP.NET Core provides many tools and libraries to secure your apps including built-in identity providers, but you can use third-party identity services such as Facebook, Twitter, and LinkedIn. With ASP.NET Core, you can easily manage app secrets, which are a way to store and use confidential information without having to expose it in the code.
Authentication vs. Authorization
Authentication is a process in which a user provides credentials that are then compared to those stored in an operating system, database, app or resource. If they match, users authenticate successfully, and can then perform actions that they're authorized for, during an authorization process. The authorization refers to the process that determines what a user is allowed to do.
Another way to think of authentication is to consider it as a way to enter a space, such as a server, database, app or resource, while authorization is which actions the user can perform to which objects inside that space (server, database, or app).
Common Vulnerabilities in software
ASP.NET Core and EF contain features that help you secure your apps and prevent security breaches. The following list of links takes you to documentation detailing techniques to avoid the most common security vulnerabilities in web apps:
- Cross-Site Scripting (XSS) attacks
- SQL injection attacks
- Cross-Site Request Forgery (XSRF/CSRF) attacks
- Open redirect attacks
There are more vulnerabilities that you should be aware of. For more information, see the other articles in the Security and Identity section of the table of contents.
Saturday, 28 November 2020
Saturday, 18 July 2020
āĻĢেāĻāϏāĻŦুāĻ āĻĒেāĻ-āĻ āĻ ্āϝাāĻāĻিāĻ āύা āĻĨেāĻেāĻ āĻাāϏ্āĻāĻŽাāϰāĻে āĻ āĻো āϰিāĻĒ্āϞাāĻ āĻĻিāύ
āĻ ্āϝাāĻāĻিāĻ āύা āĻĨেāĻেāĻ āĻাāϏ্āĻāĻŽাāϰāĻে āĻ āĻো āϰিāĻĒ্āϞাāĻ āĻĻিāύ
āϝেāĻাāĻŦে āϏেāĻিংāϏ āĻāϰāĻŦেāύ:
- āĻĒ্āϰāĻĨāĻŽে āĻāĻĒāύাāϰ Page manager app āĻি āĻāĻĒেāύ āĻāϰুāύ।
- Tools āĻ āĻĒāĻļāύে āĻ্āϞিāĻ āĻāϰুāύ ( āύিāĻেāϰ āĻĻিāĻে āϏāϰ্āĻŦāĻĄাāύে āĻŦ্āϝাāĻ āĻāĻāĻāύ)
- āĻāĻŦাāϰ settings āĻ āĻĒāĻļāύে āĻ্āϞিāĻ āĻāϰুāύ।
- āĻāĻŦাāϰ automated responses āĻ āĻ্āϞিāĻ āĻāϰুāύ।
- āĻāĻŦাāϰ Frequently asked questions āĻ āĻ্āϞিāĻ āĻāϰুāύ।
- Platform messenger āĻ āύ āĻāϰে āĻĻিāĻŦেāύ।
- āϤাāϰāĻĒāϰ add a questions āĻ āĻ্āϞিāĻ āĻāϰুāύ।
- āĻāĻŦাāϰ questions āĻŦāĻ্āϏ āĻ āĻĒ্āϰāĻļ্āύ āĻāĻŦং response āĻŦāĻ্āϏ āĻ āϏেāĻ āĻĒ্āϰāĻļ্āύেāϰ āĻāϤ্āϤāϰ āϞিāĻে āĻĻিāύ।
- āĻĄাāύāĻĻিāĻে āĻāĻĒāϰে save āĻŦাāĻāύ āĻ āĻ্āϞিāĻ āĻāϰুāύ āĻāĻŦং āĻāĻŦাāϰ save āĻ āĻ্āϞিāĻ āĻāϰুāύ।
āĻোāύ āϧāϰāύেāϰ āĻĒ্āϰāĻļ্āύ add āĻāϰāĻŦেāύ?
- āϏাāϧাāϰāĻŖāϤ āĻĄেāϞিāĻাāϰি āĻাāϰ্āĻ āĻāϤ?, āĻিāĻাāĻŦে āĻ āϰ্āĻĄাāϰ āĻāϰāĻŦ?, āĻāĻĒāύাāĻĻেāϰ āϏাāĻĨে āϝোāĻাāϝোāĻ āĻিāĻাāĻŦে āĻāϰāĻŦ? āĻāϧāϰāύেāϰ āĻĒ্āϰāĻļ্āύ āĻāĻŦং āĻāϤ্āϤāϰ āϰাāĻāϤে āĻĒাāϰেāύ।
Wednesday, 15 July 2020
How to upload a new project to Github repository
Here is how you would do it in Windows:
- If you don't have git installed, see this article on how to set it up.
- Open up a Windows command prompt.
- [shortcut way: Go to the project root . press Shift+ right click]
- Open windows powershell or command prompt
- If you follow the above shortcut your directory already located. Otherwise, Change into the directory where your source code is located in the command prompt.
- First, create a new repository in this directory
git init. This will say "Initialized empty git repository in ....git" (...is the path). - Now you need to tell git about your files by adding them to your repository. Do this with
git add filename. If you want to add all your files, you can dogit add . Here "." is also important if you need to add all the files and folders . - Now that you have added your files and made your changes, you need to commit your changes so git can track them. Type
git commit -m "adding files".-mlets you add the commit message in line.
So far, the above steps is what you would do even if you were not using github. They are the normal steps to start a git repository. Remember that git is distributed (decentralized), means you don't need to have a "central server" (or even a network connection), to use git.
Now you want to push the changes to your git repository hosted with github. To you this by telling git to add a remote location, and you do that with this command:
git remote add origin https://github.com/yourusername/your-repo-name.git
*Note: your-repo-name should be created in GitHub before you do a git remote add origin ...
you must select private if you want to keep the project only for you, not for public.
7. Open your project in Visual Studio and Go to Manage Connection> connect to github
Once you have done that, git now knows about your remote repository. You can then tell it to push (which is "upload") your commited files:
git push -u origin master
Monday, 13 July 2020
Facebook Marketing (Part-2)
āϝাāϰা āĻĢেāϏāĻŦুāĻ āĻŽাāϰ্āĻেāĻিং āĻāϰ āĻĒাāϰ্āĻ ā§§ āĻĒā§েāĻেāύ
āĻĄিāĻিāĻাāϞ āĻŽাāϰ্āĻেāĻিং āĻ āĻāĻ্āϰāĻšী
āĻŽাāϰ্āĻেāĻিং/āĻŦ্āϰ্āϝাāύ্āĻĄ āĻĒেāĻļাāĻীāĻŦী
āĻŦিāĻļ্āĻŦāĻŦিāĻĻ্āϝাāϞā§েāϰ āĻļিāĻ্āώাāϰ্āĻĨী
āĻ āύāϞাāĻāύ āĻĢ্āϰিāϞ্āϝাāύ্āϏাāϰ
āĻāĻেāϰ āĻĒাāϰ্āĻে āĻāĻŽāϰা āĻāϞোāĻāύা āĻāϰেāĻিāϞাāĻŽ āĻĒাāϰāĻĢেāĻ্āĻ āĻĢেāϏāĻŦুāĻ āĻĒেāĻ āĻি āĻāϰে āĻŦাāύাāϤে āĻšā§ āĻāĻ āύিā§ে। āĻāĻ āĻĒাāϰ্āĻে āĻāĻŽāϰা āĻāϞোāĻāύা āĻāϰāĻŦ āĻĢেāϏāĻŦুāĻ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻি,āĻিāĻাāĻŦে āĻĢেāϏāĻŦুāĻ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻĄিāĻাāĻāύ āĻāϰāϤে āĻšā§,
āĻāĻŦং āĻি āĻি āĻŦিāώā§েāϰ āĻāĻĒāϰ āύāĻāϰ āϰেāĻে āĻĢেāϏāĻŦুāĻ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻাāϞাāϤে āĻšā§ ।āĻāϞুāύ āĻāϰ āĻĻেāϰি āύা āĻāϰে āĻļুāϰু āĻāϰা āϝাāĻ
āĻĒ্āϰāĻĨāĻŽে āϝে āĻŦিāώā§āĻি āύিā§ে āĻāĻĨা āĻŦāϞāĻŦ āϤা āĻšāϞ āĻĢেāϏāĻŦুāĻ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻি ,āĻĢেāϏāĻŦুāĻ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻšāϞ āĻāĻĒāύাāϰ āĻĒেāĻ āĻĨেāĻে āĻāϰা āĻĒ্āϰāĻĻāϤ্āϤ āĻāĻĄāĻাāϰ্āĻাāĻāϏāĻŽেāύ্āĻ।āϧāϰুāύ āĻāĻĒāύি āĻ িāĻ āĻāϰāϞেāύ āĻāĻĒāύি āĻāĻĒāύাāϰ āĻĒেāĻে āĻāĻĒāύাāϰ āĻĒ্āϰāĻĄাāĻ্āĻেāϰ āĻāĻāĻি āĻŦিāĻ্āĻাāĻĒāύ āĻĻিāĻŦেāύ।āϝāĻāύāĻ āĻāĻĒāύি āĻĒেāĻে āĻāĻāĻি āĻŦিāĻ্āĻাāĻĒāύ āĻĻিāĻŦেāύ āϏেāĻি āĻšāĻŦে āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύ। āĻĒ্āϰā§োāĻāύ āĻāĻŦং āϏāĻŽā§ āĻেāĻĻে āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āϞāĻ্āώ্āϝে āĻিāύ্āύ āĻিāύ্āύ āĻšā§ে āĻĨাāĻে।āϏাāϧাāϰāĻŖāϤ āĻ্āϝাāĻŽ্āĻĒেāĻāύ ⧍ āϧāϰāĻŖেāϰ āĻšā§ে āĻĨাāĻে āĻāĻāĻি āĻšāϞ āĻĢ্āϰি āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻāϰেāĻāĻি āĻšāϞ āĻĒেāĻāĻĄ āĻ্āϝাāĻŽ্āĻĒেāĻāύ।
āĻĢ্āϰি āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻāϰাāϰ āϏāĻŦāĻেā§ে āĻাāϞো āĻāĻĒাā§ āĻšāϞ āĻāĻāύিāĻ āĻāύāĻেāύ্āĻ āĻĻিā§ে āĻĒেāĻে āĻĒোāώ্āĻ āĻāϰে āĻŽাāύুāώেāϰ āϞাāĻāĻĢে āĻ্āϝাāϞু āĻāĻĄ āĻāϰা।āĻāĻāĻি āϏিāϰিāĻ āϞāĻ্āĻ āĻāϰে āĻŦিāĻিāύ্āύ āĻ্āϰুāĻĒে āĻĒোāώ্āĻ āĻāϰা āĻāĻŦং āϏেāĻাāύ āĻĨেāĻে āĻ āϰ্āĻাāύিāĻ āĻাāĻŦে āĻ্āϰাāĻĢিāĻ āύিā§ে āĻāϏা।āĻিāĻু āĻিāĻু āĻ্āώেāϤ্āϰে āĻĢ্āϰি āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻ āύেāĻ āĻাāϞো āĻাāĻ āĻāϰে ।āĻāĻŦাāϰ āĻāϏি āĻĒেāĻāĻĄ āĻ্āϝাāĻŽ্āĻĒেāĻāύে ।āϝāĻāύ āĻāĻĒāύি āĻāĻĒāύাāϰ āĻĒ্āϰāĻĄাāĻ্āĻ āĻŦা āϏাāϰ্āĻিāϏāĻে āĻ āύেāĻ āĻŽাāύুāώেāϰ āĻাāĻে āĻĒৌāĻে āĻĻেāĻā§াāϰ āĻāύ্āϝে āĻĢেāϏāĻŦুāĻে āĻ āϰ্āĻĨ āĻĒ্āϰāĻĻাāύ āĻāϰāĻŦেāύ āϤāĻāύ āϏেāĻা āĻšāĻŦে āĻĒেāĻāĻĄ āĻ্āϝাāĻŽ্āĻĒেāĻāύ। ( āĻĒেāĻāĻĄ āĻ্āϝাāĻŽ্āĻĒেāĻāύāĻে āĻ āύেāĻে āĻŦুāώ্āĻ āĻŦāϞে।āĻŦুāώ্āĻ āĻāĻāĻা āϰাāĻŦিāĻļ āĻিāύিāϏ।āĻŦুāώ্āĻ āĻāĻĒāύাāϰ āĻ āϰ্āĻĨ āύāώ্āĻ āĻাā§া āĻāϰ āĻিāĻুāĻ āĻāϰে āύা)
āĻĢ্āϰি āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻšোāĻ āĻāϰ āĻĒেāĻāĻĄ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻĒ্āϰāϤ্āϝেāĻāĻা āĻ্āϝাāĻŽ্āĻĒেāĻāύ āϰাāύ āĻāϰাāϰ āĻāύ্āϝে āĻিāĻু āώ্āĻ্āϰ্āϝাāĻেāĻি āĻŽাāĻĨাā§ āϰাāĻāϤে āĻšāĻŦে। āĻāĻাāύে āĻāĻŽি DMAIC āύাāĻŽে āĻāĻāĻি āώ্āĻ্āϰ্āϝাāĻেāĻি āĻāĻĒāύাāĻĻেāϰ āϏাāĻĨে āĻļেā§াāϰ āĻāϰāϞাāĻŽ ।
D = Design
M = Measure
A = Analyze
I = Improve
C = Control
āĻāĻāĻি āĻ্āϝাāĻŽ্āĻĒেāĻāύ āϰাāύ āĻāϰাāϰ āĻāĻে āϏāĻŦাāϰ āĻĒ্āϰāĻĨāĻŽে āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύāĻিāĻে Design āĻāϰāϤে āĻšāĻŦে āĻāϰāĻĒāϰ āϏেāĻা Measure āĻāϰে āϰাāύ āĻāϰāϤে āĻšāĻŦে।āĻ্āϝাāĻŽ্āĻĒেāĻāύ āϰাāύ āĻāϰাāϰ āĻĒāϰে āĻĒ্āϰāϤিāύিā§āϤ āĻāĻĒāύাāĻে āĻ্āϝাāĻŽ্āĻĒেāĻāύ analysis āĻāϰāϤে āĻšāĻŦে। analysis āĻāϰে āϏেāĻ āϰেāĻাāϞ্āĻ āĻ āύুāϝাā§ী āĻ্āϝাāĻŽ্āĻĒেāĻāύāĻিāĻে Improve āĻāϰāϤে āĻšāĻŦে āĻāĻŦং āϏāϰ্āĻŦāĻļেāώ āĻāĻ āϏāĻŦ āĻিāĻুāϰ Control āĻāĻĒāύাāϰ āĻšাāϤে āϰাāĻāϤে āĻšāĻŦে।āĻ āύেāĻেāϰ āĻŽāύে āĻāĻāύ āĻĒ্āϰāĻļ্āύ āĻāϏāϤে āĻĒাāϰে āĻিāĻাāĻŦে āĻāĻāĻি āĻ্āϝাāĻŽ্āĻĒেāĻāύ Design āĻāϰāĻŦ ? āĻāĻāĻি āĻ্āϝাāĻŽ্āĻĒেāĻāύ Design āĻāϰাāϰ āĻāύ্āϝে āϝেāϏāĻāϞ āĻিāύিāϏ āĻāϰāϤে āĻšāĻŦে āϤা āĻšāϞ ঃ
# āĻĒ্āϰāĻĨāĻŽেāĻ āĻāĻāĻি āώ্āĻ্āϰ্āϝাāĻেāĻি āĻĒ্āϞ্āϝাāύিং āĻāϰāϤে āĻšāĻŦে।
# āĻāϰāĻĒāϰ āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āϞāĻ্āώ্āϝ āĻি āϤা āĻ িāĻ āĻāϰāϤে āĻšāĻŦে। ( āϞāĻ্āώ্āϝ āĻŦāϞāϤে āĻāĻĒāύি āĻাāύ āĻāĻĒāύি āĻি āĻĒেāĻে āĻŽেāϏেāĻ āĻাāύ āύা āϞাāĻāĻ āĻাāύ āύাāĻি āĻŽাāύুāώāĻে āϤāĻĨ্āϝ āĻĻিāϤে āĻাāύ)
# āĻāϰāĻĒāϰ āĻāĻĒāύাāϰ āĻাāώ্āĻāĻŽাāϰ āĻাāϰা āϤা āĻāĻĒāύাāĻে āĻুāĻে āĻŦেāϰ āĻāϰāϤে āĻšāĻŦে।
# āĻাāώ্āĻāĻŽাāϰ āĻাāϰা āĻŦেāϰ āĻāϰা āĻšā§ে āĻেāϞে āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āĻ্āϝাāĻĒāĻļāύ āĻ িāĻ āĻāϰāϤে āĻšāĻŦে।
# āϏāĻŦāĻļেāώে āĻ্āϝাāĻŽ্āĻĒেāĻāύāĻিāĻে āϰাāύ āĻāϰাāϰ āĻāύ্āϝে āĻāĻĒāύাāϰ āĻĒ্āϰā§োāĻāύ āĻšāĻŦে āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏ।
āĻāĻĒāϰেāϰ āϧাāĻĒ āĻুāϞো āĻ িāĻ āĻŽāϤ āĻĒাāϞāύ āĻāϰāϞেāĻ āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻĄিāĻাāĻāύ āϏুāύ্āĻĻāϰāĻাāĻŦে āĻšā§ে āϝাāĻŦে।āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻĄিāĻাāĻāύেāϰ āϏāĻŽā§ āϝেāϏāĻāϞ āĻŦিāώā§েāϰ āĻāĻĒāϰ āύāĻāϰ āϰাāĻāϤে āĻšāĻŦে āϤা āĻšāϞ ঃ
ā§§) āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏ ঃ
# āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏāĻিāĻে āĻ āĻŦāĻļ্āϝāĻ āĻāĻĒāύাāϰ āĻŦ্āϰ্āϝাāύ্āĻĄেāϰ āĻŦ্āϰ্āϝাāύ্āĻĄ āĻাāĻāĻĄ āϞাāĻāύ āĻŽেāύে āĻŦাāύাāϤে āĻšāĻŦে।
# āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏে āϝেāύ āĻĒ্āϰāϧাāύ āĻাāĻāĻেāϞāĻা āĻĢোāĻাāϏ āĻšā§ āϏেāĻĻিāĻে āϞāĻ্āώ āϰাāĻāϤে āĻšāĻŦে।
# āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏ āĻāϰ āĻāĻĒāϰ āĻেāĻ্āϏāĻ āϝেāύ āĻĒুāϰো āĻিāĻāĻুā§াāϞ āĻŦা āĻ্āϰাāĻĢিāĻ্āϏ ⧍ā§Ļ % āĻāϰ āĻŦেāĻļি āύাāĻš āĻšā§ āϏেāĻা āĻĻেāĻāϤে āĻšāĻŦে।
⧍) āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āĻোāύ ঃ
āĻāĻĒāύাāϰ āĻāĻĄāĻাāϰ্āĻাāĻāϏিং āĻোāύ āĻি āĻšāĻŦে āϏেāĻĻিāĻে āϞāĻ্āώ āϰাāĻāϤে āĻšāĻŦে।āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύেāϰ āϞāĻ্āώ্āϝ āĻŦāϏ্āϤু āĻāĻŦং āĻŦিāώā§েāϰ āĻāĻĒāϰ āĻিāϤ্āϤি āĻāϰে āĻāĻĒāύাāĻে āĻ িāĻ āĻāϰāϤে āĻšāĻŦে āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύ āĻোāύ āĻি āĻĢাāύি āĻšāĻŦে ,āĻāĻŽোāĻļāύাāϞ āĻšāĻŦে āύাāĻি āĻĒ্āϰāĻĢেāĻļāύাāϞ āĻŦা āϰোāĻŽাāύ্āĻিāĻ āĻšāĻŦে।
ā§Š) āĻ্āϝাāĻĒāĻļāύ ঃ
āĻāĻāĻি āĻ্āϝাāĻŽ্āĻĒেāĻāύে āĻ্āϝাāĻĒāĻļāύেāϰ āĻূāĻŽিāĻা āĻ āύেāĻ।āĻāĻāĻি āĻŦাāĻে āĻ্āϝাāĻĒāĻļāύ āĻāĻĒāύাāϰ āĻ্āϝাāĻŽ্āĻĒেāĻāύāĻিāĻে āĻĒুāϰো āύāώ্āĻ āĻāϰে āĻĻিāϤে āĻĒাāϰে। āĻ্āϝাāĻĒāĻļāύেāϰ āĻāύ্āϝে āϝে āĻŦিāώ⧠āĻĻুāĻি āĻŽাāĻĨাā§ āϰাāĻāϤে āĻšāĻŦে āϤা āĻšāϞ ঃ
# āĻ্āϝাāĻĒāĻļāύāĻিāϤে āĻāĻŽিāĻāύিāĻেāĻļāύেāϰ āĻāύ্āϝে āĻĒুāϰো āĻĄিāĻেāĻāϞāϏ āĻĻিāϤে āĻšāĻŦে ।
# āĻ্āϝাāĻĒāĻļāύে āĻ āĻŦāĻļ্āϝāĻ āĻāϞ āĻু āĻāĻāĻļāύ āĻĨাāĻāϤে āĻšāĻŦে।
āĻāĻ āĻāĻ āĻĒāϰ্āϝāύ্āϤāĻ। āĻĒāϰিāĻļেāώে āĻāĻāĻি āĻāĻĨাā§ āĻŦāϞāĻŦ āĻĢেāϏāĻŦুāĻ āĻŽাāϰ্āĻেāĻিং āĻāĻāĻা āĻŦিāĻļাāϞ āϏাāĻāϰ।āĻĢেāϏāĻŦুāĻ āĻŽাāϰ্āĻেāĻিং āĻŽাāύে āĻļুāϰু āĻŦুāώ্āĻ āĻāϰ āϞাāĻāĻ āύা ।āĻŦাংāϞাāĻĻেāĻļেāϰ āĻŽাāύুāώ āĻāĻāύো āĻĢেāϏāĻŦুāĻ āĻŽাāϰ্āĻেāĻিং āĻŽাāύে āĻļুāϰু āĻŦুāώ্āĻ āĻŦুāĻে।āĻāĻĒāύি āϤো āϏ্āĻŽাāϰ্āĻ ।āĻāĻĒāύি āĻেāύ āĻŦাāĻি āϏāĻŦাāϰ āĻŽāϤ āĻূāϞ āĻāĻ āϧাāϰāύা āύিā§ে āĻĨাāĻāĻŦেāύ ।






