# How to: Use FlowDocument Column-Separating Attributes

This example shows how to use the column-separating features of a FlowDocument.

## Example

The following example defines a FlowDocument, and sets the ColumnGap, ColumnRuleBrush, and ColumnRuleWidth attributes. The FlowDocument contains a single paragraph of sample content.

<FlowDocumentReader>
<FlowDocument
ColumnGap="20.0"
ColumnRuleBrush="DodgerBlue"
ColumnRuleWidth="5.0"
ColumnWidth="140.0"
>
<Paragraph  Background="AntiqueWhite" TextAlignment="Left">
This paragraph has the background set to antique white to make its
boundaries obvious.

The column gap is the space between columns; this FlowDocument will
have a column gap of 20 device-independend pixels.  The column rule
is a vertical line drawn in the column gap, and is used to visually
separate columns; this FlowDocument a Dodger-blue column rule that
is 5 pixels wide.

The column rule and column gap both take space between columns.  In
this case, a column gap width of 20 plus a column rule of width of 5
results in the space between columns being 25 pixels wide, 5 pixels
for the column rule, and 10 pixels of column gap on either side of the column rule.
</Paragraph>
</FlowDocument>