Code

 using (SPSite site = new SPSite("http://moss2010/"))
            {
                SPServiceContext context =
                    SPServiceContext.GetContext(site);
                UserProfileManager m_mngr = new UserProfileManager(context);

                //Get the properties
                PropertyCollection props = m_mngr.Properties;

                //Create a Dictionary to store property data.
                Dictionary<string, string> UserProps = new Dictionary<string, string>();

                foreach (Property prop in props)
                {
                    UserProps.Add(prop.Name, prop.DisplayName);
                }
                //Bind the Dictionary to a GridView control.
                GridView1.DataSource = UserProps;
                GridView1.Columns[0].HeaderText = "Property Name";
                GridView1.Columns[1].HeaderText = "Display Name";
                GridView1.DataBind();

            }