Monthly Archives: February 2016

Generate random data in an Access database in C#

Posted on February 28, 2016 by Rod Stephens

This example shows how you can generate random data for students and their test scores in an Access database. I often build examples that manipulate databases. Those examples are more interesting if the database holds lots of data, but it’s … Continue reading →

Posted in ADO.NET, algorithms, database | Tagged Access, ADO.NET, algorithms, C#, C# programming, database, example, example program, OLE DB, OleDbCommand, OleDbConnection, random, random data, randomization, Windows Forms programming | Leave a comment

Display master-detail data in a DataGrid in C#

Posted on February 26, 2016 by Rod Stephens

At design time, I added the example’s Contacts.mdb database to the project, set its “Build Action” property to Content, and set its “Copy to Output Directory” property to “Copy if newer.” That way the database is copied into the executable … Continue reading →

Posted in ADO.NET, controls, database | Tagged ADO.NET, binding, C#, C# programming, child, controls, data binding, DataAdapter, database, DataGrid, DataSet, DataTable, detail, example, example program, master, master/detail, master/detail relationship, master/detail relationships, OldDbDataAdapter, OleDbCommandBuilder, parent, parent/child, parent/child relationship, relationships, Windows Forms programming | 1 Comment

Draw a recursive overlapping snowflake fractal in C#

Posted on February 25, 2016 by Rod Stephens

The example Draw a recursive snowflake fractal in C# explains how to use an iterator and a generator to draw a snowflake fractal. This example uses the same technique with the initiator and generator shown in the second and … Continue reading →

Posted in fractals, graphics | Tagged C#, C# programming, example, example program, fractals, generator, graphics, initiator, overlapping snowflake fractal, recursion, snowflake, snowflake curve, snowflake fractal, Windows Forms programming | 1 Comment

Draw a recursive von Koch snowflake fractal in C#

Posted on February 25, 2016 by Rod Stephens

This example shows how to draw a von Koch snowflake fractal. It uses the same techniques described in the post Draw a recursive snowflake fractal in C#. The DrawSnowflake and DrawSnowflakeEdge methods are exactly the same as before. The … Continue reading →

Posted in algorithms, drawing, fractals, graphics, mathematics | Tagged algorithms, C#, C# programming, drawing, example, example program, fractals, generator, graphics, initiator, mathematics, recursion, recursive, snowflake, snowflake curve, snowflake fractal, von Koch, von Koch fractal, von Koch snowflake, Windows Forms programming | Leave a comment

Draw a recursive snowflake fractal in C#

Posted on February 25, 2016 by Rod Stephens

This program draws a recursive snowflake fractal by using an initiator and a generator to define the fractal’s shape. The initiator is a curve that represent the fractal’s basic shape. In this case, the initiator is the triangle shown … Continue reading →

Make an Excel chart in C#

Posted on February 24, 2016 by Rod Stephens

This example uses the following code to create an Excel chart in a new workbook. private void btnCreateChart_Click( object sender, EventArgs e) { // Get the Excel application object. Excel.Application excel_app = new Excel.ApplicationClass(); // Make Excel visible (optional). excel_app.Visible … Continue reading →

Posted in Excel, interoperability, Office | Tagged C#, C# programming, chart, example, example program, Excel, Excel chart, Excel graph, interoperability, Office, Windows Forms programming | 1 Comment

Graph mosquito populations in C#

Posted on February 24, 2016 by Rod Stephens

The example Simulate mosquito populations in C# simulates a mosquito population. This example draws a graph showing the population during each generation. When it calculates the populations for a new generation, it stores them in the following lists. // Data … Continue reading →

Posted in algorithms, animation, drawing, graphics, mathematics | Tagged algorithms, C#, C# programming, drawwing, example, example program, genetically modified mosquitoes, graph, graphics, graphing, mathematics, mosquito population, mosquitoes, population simulation, simulate, Windows Forms programming | Leave a comment

Simulate mosquito populations in C#

Posted on February 24, 2016 by Rod Stephens

A team of researchers at the Imperial College London are trying a new approach to mosquito control. They’ve genetically modified male mosquitoes to produce offspring who are 95% male. After a few generations, the number of females in the population … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, C#, C# programming, example, example program, genetically modified mosquitoes, mathematics, modified mosquitos, mosquito population, mosquitoes, mosquitos, population simulation, simulate, simulation, Windows Forms programming | 1 Comment

Calculate a row of Pascal’s triangle in C#

Posted on February 22, 2016 by RodStephens

Pascal’s triangle starts with a 1 at the top. To construct a new row for the triangle, you add a 1 below and to the left of the row above. After that, each entry in the new row is the … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, binomial coefficient, C#, C# programming, choose, example, example program, mathematics, n choose k, Pascal's Triangle, Windows Forms programming | 2 Comments

Print a Celsius to Fahrenheit conversion chart in C#

Posted on February 22, 2016 by RodStephens

A friend of mine cooks a lot using Japanese cookbooks. Because ovens in the United States only display temperature in degrees Fahrenheit (someone should make that a switch on the oven), she needs to convert temperatures from Celsius to Fahrenheit. … Continue reading →