You can change the color, shape, or pattern of a bar to separate it from other bars of a particular type. You can customize the appearance of all the bar styles or you can customize the appearance of an individual GanttBar if you want to highlight a specific task in your plan. The BarStyleCollection class represents the collection of different bar styles in the GanttView control. You can customize the bar style at design time using the designer, or programmatically using the code.

Change the bar style at design time

To change the bar style at design time, follow the steps given below:

1. Right-click on the C1GanttView control and select Edit Bar Styles.
   The C1GanttView.BarStyles Collection Editor appears.
2. Click Add to add a bar style to the collection.
3. Set the BarType to AutoTask.
4. Set the BarShape to ThickBar.
5. Click Add to add a bar style to the collection.
6. Set the BarType to ManualTask.
7. Set the BarShape to ThickBar.
8. Set the BarColor to PaleGreen.
9. Click OK to save and close the C1GanttView.BarStyles Collection Editor.

You can also change the bar style of a specific task at design time. To do so, open the Tasks Collection Editor and modify the BarStyles property for that specific task.

Change the bar style programmatically

You can use the BarStyles property of the C1GanttView class to add a customized bar style to the BarStyleCollection class.
Below code snippet shows how you can change bar style in the C1GanttView.

// 方法1：バーのスタイルを変更します。
BarStyle bs = c1GanttView1.GetPredefinedBarStyle(BarType.ManualTask);
bs.BarColor = Color.LightCoral;
c1GanttView1.BarStyles.Add(bs);

// 方法2：特定のタスクのバースタイルを変更します。
Task task3 = ganttView.Tasks.Search("Task 3");
    if (task3 != null)
    {
        BarStyle bs = ganttView.GetPredefinedBarStyle(BarType.ManualTask);
        bs.BarColor = Color.Green;
        bs.BarShape = BarShape.MiddleBar;
        bs.StartShape = 19;
        bs.EndShape = 19;
        task3.BarStyles.Add(bs);
    }