Hey,
try following
fillReport();
ReportPageSettings rst = reportViewer1.LocalReport.GetDefaultPageSettings();
if (reportViewer1.ParentForm.Width > rst.PaperSize.Width)
{
int vPad = (reportViewer1.ParentForm.Width - rst.PaperSize.Width) / 2;
reportViewer1.Padding = new Padding(vPad-20, 1, vPad-20, 1);
}
Hope it will help u
Best luck
Happy Coding:)