Custom PIVOT

I have Query Custom PIVOT
SET @DateList = STUFF((SELECT ',[' + CONVERT(NVARCHAR( 50),ListName) + ']' FROM List ORDER BY sort FOR XML PATH('')),1,1,'')

SET @SQL= '	SELECT *   FROM (SELECT  * FROM Result )m PIVOT(SUM(Value)  FOR ListName IN (' + @DateList + '))n '

the result table contain some column is null
i need repalce column is null to any value

please provide CREATE TABLE, INSERT INTO with sample data and your expected results