For C# 6 and higher use they autoproperty initializer syntax.
class Person
{
// Assign initial value
public string Name { get; set; } = "Johannes de Clerck";
}
For C# 5 and below use the constructor to initialize the default value.
class Person
{
public Person()
{
// Assign initial value
Name = "Johannes de Clerck";
}
public string Name { get; set; }
}