given all get_ logical method problem i cant understanding

Question

ClientSession session = reportHandler.get_Session();

int count = session.get_ReportTable().Rows.Count;

StringBuilder stringBuilder = new StringBuilder();

stringBuilder.Append("<div class='topBar'>");

stringBuilder.Append("<div class='floatleft topbar-left'><input type='search' placeholder='Page Search' class='gridsearch' id='reportGridSearch' style='width:100%;'/> </div>");

stringBuilder.Append(string.Format("<input id='reportTitle' type='text' value='{0}' maxlength='50' spellcheck='false' />", session.get_Report().get_Settings().get_ReportTitle()));

stringBuilder.Append("<div class='floatright topbar-right'>");

string[] qtyUnitsList = reportHandler.get_QtyUnitsList();

if (qtyUnitsList != null)

{