CADSoftTools

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cadEditorControl1.EditorCADPictureBox.MouseDown += EditorCADPictureBox_MouseDown;
...

void EditorCADPictureBox_MouseDown(object sender, MouseEventArgs e)
{
    CADVertex result = new CADVertex();
    result.Point = new DPoint(0, 0, 0);

    DPoint point = cadEditorControl1.GetRealPoint(e.X, e.Y, false, true);
    cadEditorControl1.Image.Selector.UseShiftToAddSelected = true;
    CADEntity entity = cadEditorControl1.Image.Selector.SelectExt(e.X, e.Y, false, true);
    if (entity.EntType == EntityType.Polyline)
    {
        CADPolyLine polyline = entity as CADPolyLine;
        foreach (CADVertex vx in polyline.Vertexes)
        {
            DPoint vxPoint = vx.Point;
            vxPoint.X = Math.Round(vx.Point.X, 4);
            vxPoint.Y = Math.Round(vx.Point.Y, 4);
            if (vxPoint.Equals(point))
            {
                result = vx;
                break;
            }
        }
    }
}