how to get all parent Id from sql server using c#

DECLARE @FindParentsForMember INT;
SET  @FindParentsForMember = 757;
WITH Hierarchy(MemId,ParentId) 
AS(
     SELECT DISTINCT parent.MemId,parent.ParentId
     FROM Members parent
     WHERE parent.MemId = @FindParentsForMember
 
     UNION ALL
 
     SELECT child.MemId,child.ParentId
     FROM Members child
     INNER JOIN Hierarchy parent ON parent.ParentId = child.MemId
)
SELECT DISTINCT ParentId
FROM Hierarchy