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Is a good or bad practice to put some business logic in a class that inherits ValidationAttribute class?

What I have tried:

public class ValidateProductCode:ValidationAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            // Declare and instantiate new DatabaseContext
            var optionsBuilder = new DbContextOptionsBuilder<DatabaseContext>();
            optionsBuilder.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=MvcCompanyDB;Trusted_Connection=true;");
            using var context = new DatabaseContext(optionsBuilder.Options);

            // Cast ValidationContext to ProductViewModel
            var model = (ProductViewModel)validationContext.ObjectInstance;

            // Declare and populate list of all Product's codes from database
            List<string> codeList = context.Products.Select(e => e.Code).ToList();

            // Check if the value is not null or empty string
            if(value!=null && value.ToString() != string.Empty)
            {
                // Declare string variable and assign it's value to values's string
                string code = value.ToString();

                // If model's Id is grater than 0 it means that ProductViewModel is used in Update operation
                if (model.Id > 0)
                {
                    // Find product record by model's Id
                    Products productsItem = context.Products.Find(model.Id);

                    // If code is modified
                    if (model.Code != productsItem.Code)
                    {
                        // If supplied code is already associated with any product in database then return error message
                        if (codeList.Contains(code))
                        {
                            return new ValidationResult("There is already product in database that has this code. Please provide different code!");
                        }
                        // Otherwise retutn success
                        else
                        {
                            return ValidationResult.Success;
                        }
                    }
                    // Otherwise retutn success
                    else
                    {
                        return ValidationResult.Success;
                    }
                }
                // otherwise it is used in create operation
                else
                {
                    // If supplied code is already associated with any product in database then return error message
                    if (codeList.Contains(code))
                    {
                        return new ValidationResult("There is already product in database that has this code. Please provide different code!");
                    }
                    // Otherwise retutn success
                    else
                    {
                        return ValidationResult.Success;
                    }
                }
            }
            // Otherwise return error message
            else
            {
                return new ValidationResult("Please provide product code!");
            }
        }
    }
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