public void InsertFirst(ColumnPath path) // Insert new segments from the specified path at the beginning of the path
{
Debug.Assert(Size == 0 || path.Output == Input, "A path must continue the first segment inserted in the beginning.");
Segments.InsertRange(0, path.Segments);
Input = path.Input;
if (Output == null)
{
Output = path.Output;
}
}