-
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
- Pedro Soares on Generate a schedule for a round robin tournament in C#
- RodStephens on Compare sorting algorithms in C#, part 4 of 5
- Nenad Zdravkovic on Compare sorting algorithms in C#, part 4 of 5
- Nenad Zdravkovic on Compare sorting algorithms in C#, part 4 of 5
- games on Solve the “Find the squares in C#” puzzle
Archives
- May 2020
- 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
Monthly Archives: August 2015
List characters that are invalid in file and path names in C#
This example uses the following code to display characters that are invalid in file and path names. private void Form1_Load(object sender, EventArgs e) { string txt = “”; foreach (char ch in Path.GetInvalidFileNameChars()) { if (Char.IsWhiteSpace(ch) || Char.IsControl(ch)) txt += … Continue reading
Posted in files, strings
Tagged C#, C# programming, example, example program, file names, files, GetInvalidFileNameChars, GetInvalidPathChars, path names, paths, strings, Windows Forms programming
Leave a comment
Let the user pick database search criteria in C#
The top part of this program holds three columns of controls. The left column contains combo boxes holding the names of the fields in a database table. The middle column holds operators such as =, <, and >=. The right … Continue reading
Posted in database, user interface
Tagged C#, C# programming, ComboBox, criteria, database, example, example program, filter, search, Text Box, user interface, Windows Forms programming
1 Comment
Flush click events in C#
If a button starts a long task, you probably don’t want the user to be able to click the button again (or perhaps not anything in the application) until the task finishes. The following code shows a straightforward attempt to … Continue reading
Posted in API, controls, events, syntax, system, threading
Tagged API, button, C#, C# programming, controls, events, example, example program, flush, flush clicks, syntax, system, threading, Windows Forms programming
12 Comments
Animate the Tower of Hanoi problem in C#
This example is similar to the example Recursively solve the Tower of Hanoi problem in C# except it uses animation to show how the disks move from one peg to another. The following AnimateMovement method moves a disk in a … Continue reading
Posted in algorithms, animation, drawing, graphics, multimedia, recursion
Tagged algorithms, animation, C#, C# programming, drawing, example, example program, graphics, multimedia, recursion, Tower of Hanoi, Tower of Hanoi problem, Tower of Hanoi puzzle, Towers of Hanoi, Towers of Hanoi problem, Towers of Hanoi puzzle, Windows Forms programming
Leave a comment
Recursively solve the Tower of Hanoi problem in C#
The example Recursively draw a binary tree in C# uses recursion to draw the branches of a tree. Good examples of recursion are hard to come by because the human brain normally thinks iteratively. For example, if you need to … Continue reading
Posted in algorithms, drawing, recursion
Tagged algorithms, C#, C# programming, drawing, example, example program, graphics, recursion, Tower of Hanoi, Tower of Hanoi problem, Tower of Hanoi puzzle, Towers of Hanoi, Towers of Hanoi problem, Towers of Hanoi puzzle, Windows Forms programming
Leave a comment
Animate gears with unequal sizes in C#
The example Animate gears in C# shows how to animate three interlocked gears. Juan Manuel Montes asked, “What if the radius of the green gear is greater?” When two gears or wheels touch each other, their outer edges must rotate … Continue reading
Posted in algorithms, animation, graphics
Tagged algorithms, animate gears, animation, C#, C# programming, draw gears, example, example program, graphics, interlocked gears, Windows Forms programming
Leave a comment
Animate gears in C#
The example Draw gears in C# explains how you can draw gears in C#. That example only needs a couple small changes to animate the gears. The previous example starts drawing with angle theta = 0 so the first part … Continue reading
Posted in algorithms, animation, graphics
Tagged algorithms, animate gears, animation, C#, C# programming, draw gears, example, example program, graphics, interlocked gears, Windows Forms programming
2 Comments
Draw an animated atom in C#
When the form’s Timer fires, its Tick event handler refreshes the form to force a redraw. The form’s Paint event handler draws the atom. private double Theta = 0; private const double Dtheta = Math.PI / 5; // Draw the … Continue reading
Posted in animation, drawing, graphics, multimedia
Tagged animated atom, animation, atom, C#, C# programming, drawing, example, example program, graphics, multimedia, transformations, Windows Forms programming
Leave a comment
Perform Windows Forms property animation in C#
Making a control’s properties change over time is called property animation. Keeping track of where a control’s properties, for example its position as it moves, can be tricky, particularly if you need to animate multiple objects at the same time. … Continue reading
Compare the performance of if-else and switch statements in C#
The example Compare the speeds of the conditional operator (ternary operator ?:) and the if-else statement in C# compares the performance of two kinds of conditional tests. Johnny Boy pointed out that this didn’t include another kind of conditional statement: … Continue reading