I have try But No use
ViewSection viewsec = KJU.CreateSectionAtBottomAndRight(doc , elem, 2, 2 );
BuiltInParameter viewtemppara = BuiltInParameter.VIEW_TEMPLATE;
ParameterValueProvider pvp = new ParameterValueProvider(new ElementId((int)viewtemppara));
// "Structural Section" is my own view templatet
FilterStringRule strrule = new FilterStringRule(pvp , new FilterStringEquals(), "Structural Section" , true);
ElementParameterFilter epf = new ElementParameterFilter(strrule);
FilteredElementCollector Collector3 = new FilteredElementCollector(doc);
IList<Element> ViewTempelem = Collector3.WherePasses(epf).ToElements();
ElementId ViewTempid = ViewTempelem[0].Id;
viewsec.ViewTemplateId = ViewTempid;