Monthly Archives: May 2020

Understand fill modes in C#

Posted on May 25, 2020 by RodStephens

C# drawing routines have two fill modes. In Windows Forms they are called Alternate and Winding. In WPF they are called Odd/Even and Non-Zero. This example lets you draw polygons and see how the two fill modes determine which points … Continue reading →

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Display COVID-19 data for US states in C#

Posted on May 16, 2020 by RodStephens

The example Graph world total COVID-19 cases, deaths, and recoveries in C# lets you view and compare COVID-19 data for countries around the world. This example lets you compare data for the US states and territories. I asked in previous … Continue reading →

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Make a random tree of generic TreeNode objects in C#

Posted on May 14, 2020 by RodStephens

The example Handle generic TreeNode mouse events in C# explains how to build a tree where each node is represent by a TreeNode object. Each TreeNode contains its own object that determines how the node is drawn. This example the … Continue reading →

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Quick COVID-19 update

Posted on May 14, 2020 by RodStephens

Recently President Trump claimed that the United States and Germany were tied for the fewest COVID-19 deaths per capita in the world. The example Graph world total COVID-19 cases, deaths, and recoveries in C# allows you to check that claim … Continue reading →

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Prevent “underlying connection was closed” errors in C#

Posted on May 6, 2020 by RodStephens

This example shows how to fix the error “The underlying connection was closed” when downloading a response from a web page. Background The basic approach for downloading a result from a web page is simple. Create a new WebClient object … Continue reading →

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Graph world total COVID-19 cases, deaths, and recoveries in C#

Posted on May 3, 2020 by RodStephens

My previous COVID-19 posts examined cases, deaths, and recoveries for different countries. I recently wanted to look at the world-wide totals, so I made this modification. Making changes to handle the world totals separately would have been a lot of … Continue reading →

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