Start and Finish lines indicates the starting and ending points of the project tasks.

You can easily change the color of the Start and Finish lines by using the StartFinishLineColor property of the C1GanttView class.

Below code snippet shows how you can change the color of the Start and Finish lines in the GanttView.

//Set the color of Start and Finish lines
c1GanttView1.StartFinishLineColor = Color.Blue;