C#: Center MessageBox

MessageBox in C# is supposed to be modal. At least that was what I expected. However, upon using it, it does not center itself against the parent container. Rather, it positions itself at the center of the screen. So if your parent container would be moved to the lower right, the MessageBox will still appear at the center no matter what. Luckily, somebody from CodeProject saved us the trouble of having to create a custom class to make this work. His custom class wraps the MessageBox class into a new class name called MsgBox but with the same constructors and usage.

Pretty nifty. Since this saved me time and trouble of having to create one for myself . You can check the article here.

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C# Load An Image Resource

When you create an application, it makes more sense to keep your images in your library as resources so that they also get packaged when you decide to go to production with your application. Loading an image resource (image file that was imported from the file system to your project and can be found under the Resources tree item) can be done using Properties.Resources.?

The ? would be the name of the resource image that is part of your resources. Visual Studio’s intellisense can easily show you the list of resources once you type Properties.Resources. .

C#: Using ListBoxes

ListBoxes are those same drop down components that you see in HTML forms. The same control called ComboBox works the same way although the appearance would be that of a 1 liner drop down box. Anyway, adding items to a ListBox object is pretty easy. Just do

MyListBox.Items.Add("Item 1");
MyListBox.Items.Add("Item 2");

But the code above will only add the labels that will apear within the ListBox. What if you want to have a ListBox that acts the same as a drop down HTML form component with a name and value attribute. You can create your own custom class with Name and Value exposed, place them inside an ArrayList object and pass it on to the ListBox’s DataSource property.

public class ListBoxItem {
 
	public String Name;
	public String Value;
 
	public ListBoxItem(String name, String value) {
		Name = name;
		Value = value;
	}
 
	public override String toString() {
		return Name;
	}
 
}
 
ArrayList al = new ArrayList();
al.Add(new ListBoxItem("Item 1", "Value1");
al.Add(new ListBoxItem("Item 2", "Value2");
 
MyListBox.DataSource = al;

You can then get the selected name (and/or value) of the ListBox by doing this

((ListBoxItem) MyListBox.SelectedItem).Name