It's not a trivial exercise to validate a file path on a Windows PC.  There are a few special cases depending on the file system and operating subsystem:

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Popularity: 42% [?]

It's easy to display an RTF file — that was embedded as a resource in a C# program — in a Windows Form RichTextControl.

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Popularity: 17% [?]

Sometimes it can be challenging to read the Details view in a ListView, especially if the rows are long.  This article shows how to add shading to every second row to make a ListView easier to read.

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Popularity: 28% [?]

It's easy to extract an application's own icon in C#:

form.Icon = Icon.ExtractAssociatedIcon( Application.ExecutablePath );

The ExtractAssociatedIcon static method on the Icon class (in System.Drawing) extracts the associated icon from any file.  By supplying the Application.ExecutablePath (in System.Windows.Forms), you extract the application's own icon.

Popularity: 16% [?]

Sadly there is no built-in function in System.IO that will copy a folder and its contents.  Following is a simple recursive algorithm that copies a folder, its sub-folders and files, creating the destination folder if needed.  For simplicity, there is no error handling; an exception will throw if anything goes wrong, such as null or invalid paths or if the destination files already exist.

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Popularity: 33% [?]

For some operations such as logging on to a web site or downloading a web page, you may not know how long it will take the operation to finish.  So instead of showing a progress bar with a specified percent complete, you can set the .NET ProgressBar to cycle continuously.

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Popularity: 37% [?]

Here is the easiest way to read an entire text file into a C# string:

string s = System.IO.File.ReadAllText( path );

Popularity: 51% [?]