SQL use comma-separated values with IN clause

Question

I am developing an ASP.NET application and passing a string value like \"1,2,3,4\" into a procedure to select those values which are IN (1,2,3,4) but its saying \"Conversion

Answer 1

DECLARE @TagId  NVARCHAR(100)  = '43,81'

SELECT * FROM TABLE WHERE TagId IN (SELECT TRIM(VALUE) FROM  STRING_SPLIT( @TagId , ',' )  )

USE STRING_SPLIT FUNCTION FOR THIS