User-350492254 posted
First, reference of CrystalDecisions.ReportAppServer.ReportDefModel in your project.
var repObjects = repClass.ReportDefinition.ReportObjects;
var txtObject = repObject["Text1"] as CrystalDecisions.CrystalReports.Engine.TextObject;
var txtFormat = txtObject.ObjectFormat;
var Hack = BindingFlags.NonPublic | BindingFlags.Instance;
ISCRTextObject rasReportObject = txtFormat.GetType().GetProperty("RasReportObject", Hack).GetValue(txtFormat, null) as ISCRTextObject;
rasReportObject.MaxNumberOfLines = 1;
txtFormat.EnableCanGrow = true;