Get Start and end date of the next week in sql server

////////////////// Sql script

declare @SelectdData varchar(10)='2019-03-04'

SELECT DATEADD(d,(9- DATEPART(dw,@SelectdData)),@SelectdData) StartDateOfWeek, DATEADD(d,6,(DATEADD(d,(9- DATEPART(dw,@SelectdData)),@SelectdData)))EndDataOfWeek

///////////////////Result