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Showing content from https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/default-values-table below:

Default values of built-in types - C# reference

Default values of C# types (C# reference)

In this article

The following table shows the default values of C# types:

Default value expressions

Use the default operator to produce the default value of a type, as the following example shows:

int a = default(int);

You can use the default literal to initialize a variable with the default value of its type:

int a = default;

Parameterless constructor of a value type

For a value type, the implicit parameterless constructor also produces the default value of the type, as the following example shows:

var n = new System.Numerics.Complex();
Console.WriteLine(n);  // output: (0, 0)

At run time, if the System.Type instance represents a value type, you can use the Activator.CreateInstance(Type) method to invoke the parameterless constructor to obtain the default value of the type.

Note

A structure type (which is a value type) may have an explicit parameterless constructor that may produce a non-default value of the type. Thus, we recommend using the default operator or the default literal to produce the default value of a type.

C# language specification

For more information, see the following sections of the C# language specification: