Tag Archives: algorithms

Generate a random password in C#

Posted on May 9, 2018 by RodStephens

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

Find duplicate files in C#, Part 4 of 4

Posted on April 19, 2018 by Rod Stephens

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

Posted on April 18, 2018 by Rod Stephens

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 →

Find duplicate files in C#, Part 2 of 4

Posted on April 17, 2018 by Rod Stephens

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 →

Find duplicate files in C#, Part 1 of 4

Posted on April 16, 2018 by Rod Stephens

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 →

Calculate hash codes for a file in C#

Posted on April 13, 2018 by Rod Stephens

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

Use LINQ with an embedded lambda expression to find prime numbers in C# (Part 3 of 3)

Posted on April 2, 2018 by Rod Stephens

The example Use more efficient LINQ to find prime numbers in C# (Part 2 of 3) uses a LINQ query to find prime numbers. It creates a delegate variable named IsOddPrime referring to a lambda expression and uses it to … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, example, example program, find prime numbers, lambda expression, LINQ, mathematics, prime numbers, Windows Forms programming | 4 Comments

Use more efficient LINQ to find prime numbers in C# (Part 2 of 3)

Posted on March 31, 2018 by Rod Stephens

The previous post showed how you can use LINQ to find prime numbers. For every number between 1 and a maximum, the LINQ query called the IsPrime method to see if the number should be part of the selection. That … Continue reading →

Use LINQ to find prime numbers in C# (Part 1 of 3)

Posted on March 30, 2018 by Rod Stephens

This example uses LINQ to find prime numbers between 1 and a maximum value that you enter. It defines the following IsPrime method to determine whether a number is prime. // Return true if the number is prime. private bool … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, example, example program, find prime numbers, LINQ, mathematics, prime numbers, Windows Forms programming | 1 Comment

Draw text on a circle in C#

Posted on February 14, 2018 by Rod Stephens

This example uses some of the techniques described in the post Measure character positions when drawing long strings in C# to draw text on a circle. The previous post explains how to determine where the characters in a string will … Continue reading →