Excel for WPF and Silverlight
PageBreak Property (XLRow)
Example 

C1.WPF.Excel Namespace > XLRow Class : PageBreak Property
Gets or sets whether there will be a forced page break after this row.
Syntax
'Declaration
 
Public Property PageBreak As System.Boolean
public System.bool PageBreak {get; set;}
Example
The code below inserts forced page breaks at every 10th row on a sheet, and clears the breaks at all other rows.
C1.C1Excel.XLSheet sheet = c1XLBook1.Sheets[0];
for (int r = 0; r < sheet.Rows.Count; r++)
{
    sheet.Rows[r].PageBreak = (r > 0 && r % 10 == 0);
}
See Also

Reference

XLRow Class
XLRow Members