Controls You Can Use on Web Forms   ASP.NET Standard Controls   CheckBox and CheckBoxList Controls

By default, the CheckBoxList control displays a single column of check boxes. However, you can specify any number of columns, and within the columns, you can specify how the items are ordered: vertically ( the default ) or horizontally. Vertical layout in three columns results in a layout such as the following:

A    D    G
B    E    H
C    F

Horizontal layout for the same items results in the following layout:

A    B    C
D    E    F
G    H

1. Set the CheckBoxList control’s RepeatColumns property to the number of columns you want.
2. Set the RepeatDirection property to Vertical or Horizontal. If you are setting the property in code, use the RepeatDirection enumeration, as shown in the following example:

myList.RepeatDirection = RepeatDirection.Horizontal;

myList.RepeatDirection = RepeatDirection.Horizontal

CheckBoxList2.aspx Run Sample | View Source

Adding Items in a List Control   Determining the Selection in a List Control   Setting the Selection in a List Control