Hi Jassim,

You can do this with DataBinding,

Have txtHostName bind to a property, for instance "Name";
Have txtHostTitle bind to another property, for instance "Title";
In Title's getter, check your flag, if set, read it's own value, otherwise, read Name

private string _name;
public string Name
{
    get{ return _Name; }
    set{ _name = value; }
}

private string _title;
bool host_title_changed;
public string Title
{
    get
    {
        if(host_title_changed)
            return _title;
        else

            return Name;
    }
    set
    {
        _title = value;
        host_title_changed = true;
    }
}