In c# in properties of classes

Question

Why we cannot write any word in the place of value in set accessor

Answer 1

Quantumspark The set parameter in C# can't be changed because it isn't explicitly declared.

VB.NET does explicitly declare the set parameter allowing it to be renamed as seen below.
--------
Class Foo
  Private _age As Integer = 0

  Public Property Age As Integer
    Get
Return _age
End Get

'Set explicitly declares the Set parameter.
    Set(ByVal age As Integer)
      _age = age
    End Set
  End Property
End Class
----

Compared to C# below:

--------
class Foo {
  private int _age = 0;

  public int Age {
    get => _age;
    set => _age = value;
  }
}
----

The C# version compiles to IL as if it was:

--------
void set_Age(int value) {
_age = value;
}

Answer 2

If by "word" you mean a string, you can do this if the field is of type string, though it wouldn't make any sense to do this, since the argument stored in the setter's "value" parameter wouldn't be set as the field's value (assuming you're using a field), but rather the regular string value you're using in place of the "value" argument.

For example:

/* This code allows the Thing.Stuff property to read and write values for the _stuff field. Any value stored in the _stuff field can be read reliably. */
public class Thing
{
private string _stuff;

public string Stuff
{
get
{
return _stuff;
}
set
{
_stuff = value;
}
}
}

/* This code has the _stuff field always storing the string value "hotdog", no matter what the "value" argument is when the setter is invoked. "hotdog" is always the string value being assigned to the _stuff field. This makes no sense to do. */
public class Thing
{
private string _stuff;

public string Stuff
{
get
{
return _stuff;
}
set
{
_stuff = "hotdog";
}
}
}