-
Recent Books:
![[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)
![[C# 24-Hour Trainer]](http://www.csharphelper.com/csharp24hr_2e_79x100.jpg)
![[Beginning Software Engineering]](http://www.csharphelper.com/sw_eng_tiny.png)
![[C# 5.0 Programmer's Reference]](http://www.csharphelper.com/csharp_prog_ref_80x100.png)
![[Essential Algorithms: A Practical Approach to Computer Algorithms]](http://www.csharphelper.com/essential_algs_81x100.jpg)
Recent Videos:
![[Mastering Events and Delegates in C#]](http://www.csharphelper.com/mastering_events_61_100.png)
![[Using Interfaces in C#]](http://www.csharphelper.com/using_interfaces_60_100.png)
![[Learning Data Structures and Algorithms]](http://www.csharphelper.com/algs_video_tiny.png)
![[Learning Visual Basic .NET]](http://www.csharphelper.com/vb_video_tiny.png)
-
Recent Posts
-
Recent Comments
Archives
- 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
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- January 2012
- December 2011
- November 2011
- May 2011
- April 2011
- February 2011
- December 2010
Categories
- .NET
- 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
- 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
- tips
- tools
- transformations
- Uncategorized
- user interface
- variables
- VBA
- web
- Windows Forms programming
- WMI
- Word
- wpf
- XAML
- XML
Meta
Monthly Archives: September 2017
Use a symbiote to graphically select hours in C#
This example modifies the previous example Graphically select hours in C# so it uses a symbiote class. That example shows how to use a PictureBox to let the user select a range of hours. If you want to let the … Continue reading
Posted in controls, graphics, user interface
Tagged C#, C# programming, controls, example, example program, graphics, hours, select hours, select time, symbiote, time, user interface, Windows Forms programming
1 Comment
Graphically select hours in C#
The DateTimePicker control lets you select dates and date ranges, but there’s no standard control that lets you select hours. This example shows one way to do this with a PictureBox. A big part of this program is the DrawHours … Continue reading
Posted in controls, graphics, user interface
Tagged C#, C# programming, controls, example, example program, graphics, hours, select hours, select time, time, user interface, Windows Forms programming
1 Comment
Remove unnecessary using directives in C#
The top of a C# code file usually includes series of using directives to tell Visual Studio which namespaces are used by the code. When you first create a project, the code files include lots of using directives that might … Continue reading
Posted in coding, performance
Tagged C#, C# programming, coding, directive, example, example program, performance, using, using directives, Windows Forms programming
Leave a comment
Draw the Weierstrass function in C#
The Weierstrass function was discovered by Karl Weierstrass in 1872. It’s an odd function that is continuous everywhere but differentiable nowhere. I’ll explain what that means shortly. Here’s the function: Here: The following two sections explain what it means to … Continue reading
Posted in algorithms, drawing, fractals, graphics, mathematics
Tagged algorithms, C#, C# programming, continuous function, differentiable function, discontinuous function, drawing, example, example program, fractals, graphics, mathematics, non-differentiable function, Weierstrass curve, Weierstrass function, Windows Forms programming
Leave a comment
Determine whether a file or directory exists in C#
It’s usually more efficient to check whether a file or directory exists before you try to access it. For example, if you try to read a file that doesn’t exist, the system needs to create error handling objects and a … Continue reading
Posted in files
Tagged C#, C# programming, directory exists, example, example program, file exists, files, Windows Forms programming
Leave a comment
Calculate Fibonacci numbers in several ways in C#
For some background on Fibonacci numbers and φ, see Examine the relationship between the Fibonacci sequence and phi in C#. This example shows several ways to calculate Fibonacci numbers. While this is mostly for curiosity’s sake, this example does demonstrate … Continue reading
“The C# Helper Top 100” now available at Barnes & Noble
My latest book, The C# Helper Top 100, is now available on Amazon here. (As was the case with Amazon, I need to contact them to update the book’s description.)
Posted in Uncategorized
Leave a comment
Recursively draw equations in C#
The basic idea for recursively drawing equations is simple. Well, sort of simple. Classes represent different kinds of equations. A particular class knows how to draw its kind of equation. It uses other classes to draw its pieces. For example, … Continue reading
Posted in algorithms, drawing, fonts, graphics, recursion
Tagged algorithms, C#, C# programming, draw equations, drawing, equations, example, example program, fonts, graphics, recursion, Windows Forms programming
2 Comments
“The C# Helper Top 100” now available at Amazon
My latest book, “The C# Helper Top 100,” is now available on Amazon here. I need to contact them to update the book’s description, though. It usually takes a couple days for books to appear on other vendors. Barnes & … Continue reading
Posted in Uncategorized
Leave a comment
Efficiently see if a string is blank in C#
This example uses three strings to compare different methods for determining whether a string is blank. One of the methods, the string class’s IsNullOrWhiteSpace method, only works in .NET Framework 4.5 or later, so this example targets that version of … Continue reading