SQL server - how to find Hexadecimal character in a table

How to search hexadecimal characters from a SQL Server table? Actually I tried like below but it is searching all zeroes in the field.

select Email,* 
from address 
where CHARINDEX(convert(varchar, Ascii(0x00)), Email) > 0



I had a similar problem where a hexadecimal character was crashing a query. This is what I did to find it.

select Email
from address
where Email like '%' + CHAR(0x00) +'%'

Now to stop the bad data getting in in the first place...

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