How to set Widh and Height for Picture object

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C#

CrystalReports

Hi i want to Know how to set Width and Height for Crystal Report Picture Object through C#
Coding.

I tried this,

ReportDocument rpt = new ReportDocument();
               rpt.Load(Application.StartupPath + "\\REPORTS\\ProductBarcode.rpt");
               rpt.SetDataSource(ds.Tables[0]);


               PictureObject TAddress1 = (PictureObject)rpt.ReportDefinition.Sections[0].ReportObjects["BarcodeImage1"];
               TAddress1.Width = 2000;
               TAddress1.Height = 3000;

               crystalReportViewer1.ReportSource = rpt;

               rpt.Refresh();

but i got error:
Unable to cast object of type 'CrystalDecisions.CrystalReports.Engine.BlobFieldObject' to type 'CrystalDecisions.CrystalReports.Engine.PictureObject'.

Anybody help me please.