Columns

public List<ViewColumn> Columns { get; }

var project = new Project(DataDir + "Project2.mpp");
var options = new PdfSaveOptions();
var columns = new List<ViewColumn>
{
    new GanttChartColumn("Name", 100, Field.TaskName),
    new GanttChartColumn("Start", 100, Field.TaskStart),
    new GanttChartColumn("Finish", 100, Field.TaskFinish),
    new GanttChartColumn("Cost2", 80, Field.TaskCost2),
    new GanttChartColumn("Number6", 80, Field.TaskNumber6),
    new GanttChartColumn("Date6", 80, Field.TaskDate6),
    new GanttChartColumn("Flag6", 80, Field.TaskFlag6),
    new GanttChartColumn("Flag18", 80, Field.TaskFlag18),
    new GanttChartColumn("Duration6", 80, Field.TaskDuration6)
};
options.View = new ProjectView(columns);

// iterate over view columns
foreach (var column in options.View.Columns)
{
    Console.WriteLine("Column Name: " + column.Name);
}

options.PresentationFormat = PresentationFormat.TaskUsage;
project.Save(OutDir + "TaskUsageProjectView_Columns.pdf", options);