C# List 過濾，排序，刪除

taskList_IsManager.Where(p => p.IsManager == "1").ToList();

taskList = taskList.OrderBy(p => p.IsManager).ToList();

//刪除taskList為1的用戶
for (int i = 0; i < taskList.Count; i++)
{
if (taskList[i].IsManager == "1")
taskList.Remove(taskList[i]);
}