How do you give a C# Auto-Property a default value?

class Person
{
    public Person()
    {
        Name = "Default Name";
    }
    public string Name { get; set; }
}

private string name = "Default Name";
public string Name
{
    get
    {
        return name;
    }
    set
    {
        name = value;
    }
}

class Person
{
    public Person()
    {
        //do anything before variable assignment

        //assign initial values
        Name = "Default Name";

        //do anything after variable assignment
    }
    public string Name { get; set; }
}

class Person
{
    private string _name;
    public string Name
    {
        get
        {
            return string.IsNullOrEmpty(_name) ? "Default Name" : _name;
        }

        set { _name = value; }
    }
}

private bool bShowGroup ;
[Description("Show the group table"), Category("Sea"),DefaultValue(true)]
public bool ShowGroup
{
    get { return bShowGroup; }
    set { bShowGroup = value; }
}

public class DefaultValuesTest
{
    public DefaultValuesTest()
    {
        foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(this))
        {
            DefaultValueAttribute myAttribute = (DefaultValueAttribute)property.Attributes[typeof(DefaultValueAttribute)];

            if (myAttribute != null)
            {
                property.SetValue(this, myAttribute.Value);
            }
        }
    }

    public void DoTest()
    {
        var db = DefaultValueBool;
        var ds = DefaultValueString;
        var di = DefaultValueInt;
    }


    [System.ComponentModel.DefaultValue(true)]
    public bool DefaultValueBool { get; set; }

    [System.ComponentModel.DefaultValue("Good")]
    public string DefaultValueString { get; set; }

    [System.ComponentModel.DefaultValue(27)]
    public int DefaultValueInt { get; set; }
}

class Person
{
    /// Gets/sets a value indicating whether auto
    /// save of review layer is enabled or not
    [ System.ComponentModel.DefaultValue(true)]
    public bool AutoSaveReviewLayer { get; set; }
}

class Person
{
    private string _name;

    [DefaultValue(true)]
    public string Name
    {
        get  { return _name; }
        set { _name = value; }
    }
}