In order to change the default format (A4) of a report, you must change the report properties to accept a custom paper size.
Set PaperSize By GUI
Step 1
Open your report and right click (on the gray pane, not the report itself) to select "Report Properties"
Step 2
Choose Landscape for your orientation and select a custom paper size. Specify your width and height as well.
Programmatically Set PaperSize
- Paper Size should be the size in inches multiplied by 100
- Width: The width of the paper, in hundredths of an inch
- Height: The height of the paper, in hundredths of an inch
Here is the code I used to programmatically set a custom paper size to my report
ReportViewer1.PrinterSettings.DefaultPageSettings.PaperSize = new PaperSize("Custom", 650, 325)
**Note: Don't forget, you may need to use the code ReportViewer1.RefreshReport()
if it doesn't work.*
For more information, visit MSDN's PaperSettings.PaperSize page