WISE OWL EXERCISES
VISUAL C# EXERCISES
- Creating forms (4)
- Coding form events (1)
- Laying out your code (2)
- C# variables (4)
- Enumerations and constants (2)
- Conditions (2)
- Modular code (3)
- Arrays (2)
- Looping (2)
- Files and folders (3)
- Properties in C# (3)
- Using lists (3)
- Validating forms (6)
- Toolbars, menus and status bars (1)
- FileDialogs and StreamReaders (1)
- Debugging and trapping errors (1)
- Introduction to DataGridViews (1)
- DataGridView events (3)
- Complex DataGridViews (2)
- Creating classes (2)
- The form as a class (1)
- Data structures (4)
- Inheritance (4)
- Interfaces (2)
- Delegates and events (2)
- Writing LINQ (1)
- Advanced LINQ (3)
- LINQ to SQL models (1)
- Writing LINQ to SQL (2)
- Grouping using LINQ (2)
Visual C# | Using lists exercise | Generate a list of Friday the 13ths!
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To avoid having to draw the form needed for this exercise, right-click on the name of your project in Solution Explorer then choose Add --> Existing Item... (you can also press SHIFT + ALT + A to do the same thing).
Choose only the file called frmUnluckyDates.cs in the above folder to import it into your project, then edit Program.cs to make this the default form.
For the rest of this exercise, you may find the following snippet of code useful, to give you ideas on how to handle dates in C#:
// get the 13th of this month
DateTime startDate = System.DateTime.Today;
startDate = new DateTime(startDate.Year,startDate.Month,13);
Also, you may find the AddMonths method useful (this adds a given number of months to any date).
Attach code to the left-hand button so that when you click on it you see something like this:
When you click on the button it should create a list of the next (say) 5 years' worth of dates which are on the 13th of the month, then set this list to be the data source of the list box. Your list will be probably a bit more up to date!
Now get the right button to go through the list built up, using the FindAll lambda function (or some other method) to count only those dates which fall on a Friday:
Use .Items.Clear on your list to remove all existing items, then .Items.Add to add new ones in one by one, whenever you find a date which is a Friday.
If you haven't covered lambda functions on the course, don't despair - have a look at the relevant page in your courseware!
Make plans for what you'll do on all these days to keep out of trouble, then close everything down.