SQL: Taking the result from a dynamics sp_executesql query

DECLARE @SQLString nvarchar(500);

DECLARE @ParmDefinition nvarchar(500);

DECLARE @CountSQLQuery varchar(30);

SET @SQLString = N'SELECT @result = COUNT(*) FROM INFORMATION_SCHEMA.TABLES';

SET @ParmDefinition = N'@result varchar(30) OUTPUT';

EXECUTE sp_executesql @SQLString, @ParmDefinition, @result=@CountSQLQuery OUTPUT;

SELECT CAST(@CountSQLQuery as int);