I am Trying to create structure based on parent child

Wants to create

• based structure  by using table based on parent child roots upto n levels .. facing an issu
  • TECH
    • Company Maintenance
    • Employees
    • Human Resources
  • XRP
    • Company Maintenance
    • Employees
    • Human Resources

  write  below code but facing an issue:

    using (DatabaseContext ctx = new DatabaseContext())
        {
          var Alllocations = ctx.GetAllLocations().Where(x => x.ClientId == clientno);
          int count = Alllocations.Count();
          foreach (var location in Alllocations)
          {
            int LevelCount = 0;
            string[] leveld;
            LevelCount = location.LevelID.Split('>').Length;
             leveld=  location.LevelID.Split('>');
            string max=string.Empty;
            int level = 0;
            
            for (int i = 0; i <=LevelCount; i++)
            {
              if (location.ParentID == null&& LevelCount==1)
              {
                Option += "

  ";
              }
              max = leveld.Max();
              level++;
            }
            int n = 0;
            while (n != level)
            {
              if (max != string.Empty && n==level)
              {
                Option += "
  ";
                break;
              }
              n++;
            }
            

            Option += "

• "+ ""+location.Self_Description + "" + "
";
            //Option += "