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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