linqtosql order by string with numbers

Hi ,
Thanks !
Am using linqtosql and C#.

Have attached the screen shot of the datasource .
I need to order the list by name,  (Screen shot is attached ) but name is alphanumeric string. Each record under name starts with section ??:  i.e. Section 12 : test
                          Section 11: test
                          Section 00: test


I need to order by name by sort through numbers which you see  within the string


Expected output:
=============
{Folderkey=27, Name="Section1:Underwriting"}
{Folderkey=25, Name="Section2:Third-Parth Reports"}
{Folderkey=4, Name="Section3:Borrower"}

code:

public ActionResult FolderRearrangePopupLoad(Guid taskInstanceId, string Model)
        {
            var nums = "0123456789".ToCharArray();//skumar:20180104 for task#
            var reordermodel = new FileReorderModel { TaskInstanceId = taskInstanceId };

            var FileList = (from filelist in taskManager.GetAllTaskFileByTaskInstanceId(taskInstanceId)
                            select new
                            {
                                filelist.TaskFileId,
                                Name = filelist.FileName

                            });

            ViewBag.FileList = FileList;


            var folderlist = (from folders in appProcessManager.GetFolderbyViewId(1)
                              orderby folders.FolderName.LastIndexOfAny(nums)
                              orderby folders.FolderName
                              select new
                              {
                                  folders.FolderKey,
                                  Name = folders.FolderName

                              });
            ViewBag.FromFolder = new SelectList(folderlist, "FolderKey", "Name");

Select allOpen in new window

Kind regards,
Suresh
Folder-list.PNG