Category Archives: extensions

Make a TextBox preview extender provider in C#

Posted on August 22, 2017 by Rod Stephens

This example shows how to convert the TextBox preview techniques described in the last few posts into an extender provider. The previous examples showed the basic technique, but they were hard-wired to specific TextBox controls so they weren’t very flexible. … Continue reading →

Posted in controls, extensions, user interface | Tagged C#, C# programming, context menu, ContextMenuStrip, controls, data entry, example, example program, extender provider, extensions, integer TextBox, preview changes, TextBox, use interface, Windows Forms programming | Leave a comment

Use string extension methods to validate Social Security numbers in C#

Posted on June 19, 2017 by Rod Stephens

This example defines three extension methods that return true if strings contain Social Security numbers. Recall that you must add extension methods to a static class and that the methods must be static. This example begins by defining a Matches … Continue reading →

Posted in extension methods, extensions, regular expressions, strings | Tagged C#, C# programming, example, example program, extension methods, extensions, regular expressions, Social Security numbers, strings, Windows Forms programming | 4 Comments

Add an extension method to the Graphics class in C#

Posted on September 14, 2016 by Rod Stephens

For some strange reason, the Graphics class’s DrawRectangle method cannot take a RectangleF as a parameter. It can take a Rectangle or four float values, and the FillRectangle method can take a RectangleF as a parameter, but the DrawRectangle method … Continue reading →

Posted in drawing, extension methods, extensions, graphics | Tagged C#, C# programming, drawing, DrawRectangle, example, example program, extension method, extensions, graphics, Graphics class, Graphics object, RectangleF, Windows Forms programming | Leave a comment

Make string extensions to URL encode and decode strings in C#

Posted on September 21, 2015 by Rod Stephens

When you URL encode a string, you convert special characters into numeric sequences thath are safe to use in a URL. When you URL decode a string, you reverse the process. The following code creates extension methods for the string … Continue reading →

Posted in extension methods, extensions, strings | Tagged C#, C# programming, example, example program, extension methods, extensions, string extensions, strings, URL decode, URL encode, Windows Forms programming | Leave a comment

Convert between byte arrays and hexadecimal strings in C#

Posted on September 26, 2014 by Rod Stephens

This example uses extension methods to convert between byte arrays and hexadecimal strings. It adds a ToHex extension method to the byte[] type and a ToBytes extension method to the string class. To create an extension method, create a public … Continue reading →

Posted in algorithms, cryptography, extensions, strings | Tagged algorithms, byte array, byte array to hexadecimal string, C#, C# programming, converrt byte array, convert, convert hexadecimal string, cryptography, example, example program, extensions, hexadecimal string to byte array, string extentions, strings, Windows Forms programming | 2 Comments

Use the BitConverter class to write extension methods to convert between byte arrays and strings of hexadecimal values in C#

Posted on January 11, 2014 by Rod Stephens

This is a new version of the example Write extension methods to convert between byte arrays and strings of hexadecimal values in C# that takes a slightly different approach. The following code shows the new versions of the extension methods. … Continue reading →

Posted in extension methods, extensions, strings | Leave a comment