Built-in attributes (Obsolete, Serializable) in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mark the class as obsolete.

C Sharp (C#)

[[1]("Use NewClass instead")]
public class OldClass
{
}

Drag options to blanks, or click blank then click option'

AObsolete

BSerializable

CNonSerialized

DDeprecated

Attempts:

3 left

💡 Hint

Common Mistakes

Using Serializable instead of Obsolete.

Trying to use Deprecated which is not a C# attribute.

The Obsolete attribute marks code as outdated and shows a warning when used.

2fill in blank

medium

Complete the code to make the class serializable.

C Sharp (C#)

[[1]]
public class Data
{
    public int Id;
}

Drag options to blanks, or click blank then click option'

ASerializable

BObsolete

CNonSerialized

DDataContract

Attempts:

3 left

💡 Hint

Common Mistakes

Using Obsolete instead of Serializable.

Confusing NonSerialized which is for fields, not classes.

The Serializable attribute allows the class to be converted to a format for storage or transfer.

3fill in blank

hard

Fix the error in the code to correctly mark the field as not serializable.

C Sharp (C#)

[Serializable]
public class User
{
    public string Name;
    [[1]]
    public string Password;
}

Drag options to blanks, or click blank then click option'

ASerializable

BNonSerialized

CObsolete

DIgnoreDataMember

Attempts:

3 left

💡 Hint

Common Mistakes

Using Serializable on a field inside a Serializable class.

Using Obsolete which is unrelated to serialization.

The NonSerialized attribute prevents a field from being serialized.

4fill in blank

hard

Fill both blanks to mark the class as obsolete and serializable.

C Sharp (C#)

[[1]("This class is outdated")]
[[2]]
public class OldData
{
    public int Value;
}

Drag options to blanks, or click blank then click option'

AObsolete

BSerializable

CNonSerialized

DDeprecated

Attempts:

3 left

💡 Hint

Common Mistakes

Using Deprecated which is not a valid C# attribute.

Mixing up NonSerialized which is for fields only.

Use Obsolete to mark the class as outdated and Serializable to allow serialization.

5fill in blank

hard

Fill all three blanks to mark the class obsolete, make it serializable, and exclude a field from serialization.

C Sharp (C#)

[[1]("Use NewUser instead")]
[[2]]
public class User
{
    public string Username;
    [[3]]
    public string Password;
}

Drag options to blanks, or click blank then click option'

AObsolete

BSerializable

CNonSerialized

DDeprecated

Attempts:

3 left

💡 Hint

Common Mistakes

Using Deprecated which is not a C# attribute.

Forgetting to exclude sensitive fields from serialization.

Obsolete marks the class as outdated, Serializable allows serialization, and NonSerialized excludes the Password field.