-
Recent Books:
![[Essential Algorithms, Second Edition]](http://www.csharphelper.com/essential_algs_2e_158_200.jpg)
![[WPF 3d, Three-Dimensional Graphics with WPF and C#]](http://www.csharphelper.com/wpf3d_160_200.png)
![[The C# Helper Top 100]](http://www.csharphelper.com/top100_161_200.png)
![[Interview Puzzles Dissected]](http://www.csharphelper.com/interview_puzzles_161_200.jpg)
-
Recent Posts
-
Recent Comments
- RodStephens on Move and resize multiple shapes in WPF and C#
- Aso on Move and resize multiple shapes in WPF and C#
- RodStephens on Build a DataTable and bind it to a DataGridView in C#
- Manuele on Build a DataTable and bind it to a DataGridView in C#
- Ktsdos on Register a program for a particular system in C#
Archives
- April 2020
- March 2020
- February 2020
- January 2020
- December 2019
- November 2019
- October 2019
- September 2019
- August 2019
- July 2019
- June 2019
- May 2019
- April 2019
- March 2019
- February 2019
- January 2019
- December 2018
- November 2018
- October 2018
- September 2018
- August 2018
- July 2018
- June 2018
- May 2018
- April 2018
- March 2018
- February 2018
- January 2018
- December 2017
- November 2017
- October 2017
- September 2017
- August 2017
- July 2017
- June 2017
- May 2017
- April 2017
- March 2017
- February 2017
- January 2017
- December 2016
- November 2016
- October 2016
- September 2016
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- July 2015
- June 2015
- May 2015
- April 2015
- March 2015
- February 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- February 2014
- January 2014
- December 2013
- October 2013
- August 2013
- June 2013
- December 2012
- September 2012
- July 2012
- June 2012
- November 2011
- May 2011
- April 2011
- February 2011
- December 2010
Categories
- .NET
- 3D
- 3D graphics
- ADO.NET
- algorithms
- animation
- API
- arrays
- attributes
- audio
- books
- C#
- C# programming
- calculations
- challenges
- classes
- clipboard
- coding
- combinatorics
- console
- controls
- cryptography
- curve fitting
- database
- debugging
- dialogs
- directories
- Drag and Drop
- drawing
- drawings
- enums
- Event
- events
- example program
- Excel
- extension methods
- extensions
- files
- finance
- fonts
- formatting
- forms
- fractals
- ftp
- games
- GDI+
- generic
- geometry
- globalization
- graphics
- html
- IDE
- image processing
- inheritance
- interfaces
- internationalization
- internet
- interoperability
- LINQ
- lists
- localization
- mathematics
- memory
- menus
- MessageBox
- methods
- miscellany
- multimedia
- network
- Office
- OOP
- operators
- parsing
- performance
- phone
- PowerPoint
- printers
- printing
- productivity
- programs
- puzzles
- recursion
- reflection
- registry
- regular expressions
- serialization
- settings
- SQL
- stories
- strings
- syntax
- system
- threading
- three-dimensional graphics
- tips
- tools
- transformations
- Uncategorized
- user interface
- variables
- VBA
- web
- Windows Forms programming
- WMI
- Word
- wpf
- XAML
- XML
Meta
Tag Archives: cryptography
New Book: The Modern C# Challenge
My latest book, The Modern C# Challenge, is now available. It’s a collection of 100 programming challenges that let you test your ability in a wide variety of programming topics, many of which are not usually covered in traditional programming … Continue reading
Posted in algorithms, books, files, mathematics, puzzles
Tagged algorithms, books, C#, C# programming, combinations, cryptography, directories, dynamic programming, example, example program, factors, files, geometry, mathematics, permutations, prime factors, puzzles, randomization, recursion, simulations, statistics, The Modern C# Challenge, Windows Forms programming, yield
1 Comment
Generate a random password in C#
As I mentioned in a recent post, you should always use a strong password for every login. Remember, a computer can perform millions or billions of operations per second, so your daughter’s birthday or the name of your son’s guinea … Continue reading
Posted in algorithms, cryptography, internet
Tagged algorithms, C#, C# programming, cryptography, example, example program, internet, password, password generator, Windows Forms programming
Leave a comment
Make the user enter a password to use a program in C#
The example Display a simple password dialog before a program starts in C# displays a simple password form. It compares the value entered by the user with a string inside the program to decide whether the user entered the right … Continue reading
Posted in cryptography, dialogs, programs
Tagged C#, C# programming, cryptography, decrypt, dialogs, encrypt, example, example program, password, programs, Windows Forms programming
1 Comment
Find duplicate files in C#, Part 4 of 4
The last three posts described an application that searches for duplicate files and removes them. The program seems to work fairly well, at least for small test directories. When I tried it on a directory containing around 8,000 files, however, … Continue reading
Posted in algorithms, cryptography, files, system, tools
Tagged algorithms, C#, C# programming, compare files, cryptography, duplicate files, example, example program, files, find duplicate files, find duplicates, hash codes, hash files, hashing, remove duplicate files, remove duplicates, system, tools, Windows Forms programming
1 Comment
Find duplicate files in C#, Part 3 of 4
The last two posts described an application that searches for duplicate files and removes them. This post explains how the program removes the files when you click the Delete Selected button. When you click the button, the following code executes. … Continue reading
Posted in algorithms, cryptography, files, system, tools
Tagged algorithms, C#, C# programming, compare files, cryptography, duplicate files, example, example program, files, find duplicate files, find duplicates, hash codes, hash files, hashing, remove duplicate files, remove duplicates, system, tools, Windows Forms programming
Leave a comment
Find duplicate files in C#, Part 2 of 4
The previous post Find duplicate files in C#, Part 1 of 4 explained how the example uses a LINQ query to select files grouped by hash code. This post explains how the program displays the files’ contents and how the … Continue reading
Posted in algorithms, cryptography, files, system, tools
Tagged algorithms, C#, C# programming, compare files, cryptography, duplicate files, example, example program, files, find duplicate files, find duplicates, hash codes, hash files, hashing, remove duplicate files, remove duplicates, system, tools, Windows Forms programming
1 Comment
Find duplicate files in C#, Part 1 of 4
This example lets you find and remove duplicate files. It’s fairly complex, so I’m going to cover it’s more interesting pieces in several posts. I won’t cover some of the less interesting pieces at all. Enter a directory path or … Continue reading
Posted in algorithms, cryptography, files, system, tools
Tagged algorithms, C#, C# programming, compare files, cryptography, duplicate files, example, example program, files, find duplicate files, find duplicates, hash codes, hash files, hashing, remove duplicate files, remove duplicates, system, tools, Windows Forms programming
2 Comments
Calculate hash codes for a file in C#
Hash codes are codes that concisely represent files or other chunks of data. The basic idea is to combine the data’s bytes in ways so that two different files are likely to have different hash codes. If you save a … Continue reading
Posted in algorithms, cryptography, files
Tagged algorithms, C#, C# programming, cryptography, example, example program, files, hash codes, hash file, hashing, MD5, SHA256, Windows Forms programming
1 Comment
Book Errata Page: The C# Helper Top 100
This is the errata page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. If you find mistakes, please post them here in the Leave a Reply box at the bottom of the page. … Continue reading
Posted in .NET, algorithms, books, C#, C# programming
Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, threading, tips, tools, Windows Forms programming
2 Comments
Book Discussion Page: The C# Helper Top 100
This is a discussion page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. Please post questions, thoughts, and suggestions here in the “Leave a Reply” box at the bottom of the page. I … Continue reading
Posted in .NET, algorithms, books, C#, C# programming
Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, threading, tips, tools, Windows Forms programming
2 Comments