How to Set Page size in RDLC

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C#

RDLC

I want to set Page width to 75 mm while printing as printer is Roll printer.how to set the width and height in RDLC report viewer.
my code is below but not able to print.Report is display properly in report viewer but while printing because of page size not able top print.

if (dt != null)
            {
                if (dt.Rows.Count > 0)
                {
                    ds.Tables.Add(dt);
                    ds.Tables[0].TableName = "OrderBill";
                    this.OrderBillBindingSource.DataSource = ds;
                }
            }

            //this.OrderBillBindingSource.DataSource = ds;
            this.reportViewer1.RefreshReport();
            this.reportViewer1.Width = 75;
            this.reportViewer1.RefreshReport();