public IHttpActionResult GetTaskByProjectId(int projectId)
{
var taskBL = new TaskBL(_context);
var allTasks = taskBL.GetByProjectId(projectId);
var tasks = (from ts in allTasks
from pts in allTasks
.Where(x => x.TaskId == ts.ParentId)
.DefaultIfEmpty()
select new
{
TaskId = ts.TaskId,
TaskName = ts.TaskName,
Priority = ts.Priority,
StartDate = ts.StartDate.ToString("dd-MM-yyyy"),
EndDate = ts.EndDate.ToString("dd-MM-yyyy"),
ParentTaskName = pts?.TaskName,
EndTask = ts.EndTask,
IsParent = ts.IsParent
}).ToList();
return(Ok(tasks));
}