43. What is the importance of a Button control?
A Button control is an important Windows control, which provides the most common way of creating and handling an event in the code with the help of its Click event.
44. How can you unselect the selected items in a ListView control programmatically in .NET 4.0?
The syntax to unselect the selected items in the ListView control is shown in the following code snippets:
Code for VB:
Me.listView1.SelectedItems.Clear()
Code for C#:
this.listView1.SelectedItems.Clear();
45. How can you get the text of the RichTextBox control, including all rich text format strings in .NET 4.0?
The Rtf property of the RichTextBox control is used to set or get texts, including the RTF format code.
46. What is the use of a Timer control? Can a Timer control pause?
The Timer control is a mechanism to perform an iterative task at a specified time interval. You cannot pause it because it can only start and stop.
47. What is die difference between a CheckBox control and a RadioButton control?
A CheckBox control is square shaped; whereas, a RadioButton control is round in shape. Moreover, you can select more than one CheckBox control from a group of CheckBox controls; whereas, you can select only a single RadioButton control from a group of RadioButton controls.
48. Can you write a class without specifying a namespace? Which namespace does it belong to by default?
Yes, we can write a dass without specifying namespace and that class belongs to a global namespace that has no name.