The ITextObject control that is dragged and dropped in the .rtp file does not generate an object in the .cs file, so it cannot be controlled. I wonder if there are other ways to control the display content of the report header?
CrystalReport1.ReportDefinition.ReportObjects ["myField"]. Text
If you want to set
CrystalReport1.ReportDefinition.ReportObjects ["myField"]. Text = {"Table name.Field"}