Tag Archives: events

Let the user draw lines in C#

Posted on December 1, 2018 by RodStephens

This example lets the user click and draw to draw lines. To make working with lines easier, the program uses the following Segment class. class Segment { public Pen Pen; public Point Point1, Point2; public Segment(Pen pen, Point point1, Point … Continue reading →

Posted in drawing, events, graphics | Tagged C#, C# programming, draw lines, drawing, events, example, example program, graphics, MouseDown, MouseMove, MouseUp, Windows Forms programming | Leave a comment

Use reflection to list a class’s events in C#

Posted on February 27, 2018 by Rod Stephens

This example uses the following code to add some simple events to the Form1 class. // Make some events. public delegate int MyPublicDelegate(string index); public event MyPublicDelegate MyPublicEvent; private delegate int MyPrivateDelegate(string index); private event MyPrivateDelegate MyPrivateEvent; public virtual event … Continue reading →

Posted in reflection | Tagged C#, C# programming, EventInfo, events, example, example program, GetEvents, list events, reflection, Windows Forms programming | Leave a comment

Make a class define and raise events in C#

Posted on November 9, 2017 by Rod Stephens

This example uses a BankAccount class to manage a bank account (and to show how to define and raise events). If the program tries to remove more money from the account than its current balance, the BankAccount object raises an … Continue reading →

Posted in classes, events | Tagged C#, C# programming, classes, define and raise events, define event handlers, define events, event handlers, EventArgs, events, example, example program, raise events, Windows Forms programming | 5 Comments

Book Errata Page: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

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

Posted on September 4, 2017 by RodStephens

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 →

Table of Contents: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is a brief summary of the book’s table of contents. Introduction Part I. Serialization 1. Read a CSV File into an Array (1) 2. Use JSON to Serialize and Deserialize Objects (49) Part II. Graphing 3. Draw a Graph … Continue reading →

New Book: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

I’m happy to announce my latest book, The C# Helper Top 100, The 100 most popular posts at csharphelper.com. It describes the 100 most popular posts on the C# Helper web site. This is my 32nd book and my second … 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, The C# Helper Top 100, threading, tips, tools, Windows Forms programming | Leave a comment

Use the mouse wheel to scale an image in C#

Posted on August 7, 2017 by RodStephens

This example lets you use the mouse wheel to zoom in and out on an image. To use the mouse wheel, the program needs to catch the MouseWheel event. Unfortunately that event isn’t listed in the Form Designer so you … Continue reading →

Posted in events, graphics, image processing | Tagged C#, C# programming, events, example, example program, graphics, image processing, mouse wheel, scale, Windows Forms programming, zoom | Leave a comment

Handle NumericUpDown value change events in C#

Posted on August 12, 2016 by Rod Stephens

The post Make a NumericUpDown use decimal values in C# shows how you can make a NumericUpDown control display decimal values. When the user clicks a NumericUpDown control’s arrows or presses the up or down arrow key while the control … Continue reading →

Posted in controls, mathematics | Tagged C#, C# programming, controls, events, example, example program, mathematics, NumericUpDown, NumericUpDown control, Windows Forms programming | Leave a comment

Use global command bindings in WPF and C#

Posted on September 17, 2015 by RodStephens

The example Use custom command bindings in WPF and C# explains how you can make a program use custom commands. (This is a confusing topic so read that post before you continue with this one.) That technique doesn’t quite work … Continue reading →