The ImageList control is a component; therefore, it appears in the component tray at the design time.

To avoid dropping of a Combobox, you need to override the WndProc() method and ignore WM_LBUTTONDOWNand WM_LBUTTONDBLCLK events.

The CheckState property gets or sets the state of CheckBox.

If the ThreeState property is set to false, the CheckState property value can only be set toCheckState.Indeterminate in code and not by user interaction.

Checked - The CheckBox displays a check mark. The control appears sunken.
Unchecked - The CheckBox is empty. The control appears raised.
Indeterminate - The CheckBox displays a check mark and is shaded.

To select an item from the ListView control, you can use the following code snippet:
//Make sure the listview has focus
listview1.Focus();
listview1.Items[i].Selected = true;

The TextBox control is an input control, which allows a user to enter text to an application at runtime. By default, it allows only single line text; however, you can change its property to accept the multiline text as well as scroll bar also.

The RichTextBox control is similar to the TextBox control with the difference that it allows the user to format its text also. You can format the text in various ways, such as bold, italic, and underlined as well as change its color and font. You can save your RichTextBox value to a RTF (Rich Text Format) file and load value of RTF file to the RichTextBox control.