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web usercontrol not returning variable to aspx page asp.net

Hi Experts,

I'm currently writing an asp.net website and looking at user controls. I have managed to input variables into the usercontrol and display them but when I click the button on the usercontrol to return to the aspx page it does not feedback the output variable that i'm setting "MyResult" within the control. What am I doing wrong please. The code is: -

DynamicUsercontrol.aspx.cs :-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Testing
{
    public partial class DynamicUsercontrol : System.Web.UI.Page
    {
        QuestionType1 ucSimpleControl = new QuestionType1();

        protected void Page_Load(object sender, EventArgs e)
        {
            //ucSimpleControl.MyResult = "test";
            lblReturn.Text = ucSimpleControl.MyResult;
        }


        protected void cmdAdd_Click(object sender, EventArgs e)
        {
            ucSimpleControl = LoadControl("~/QuestionType1.ascx") as QuestionType1;
            ucSimpleControl.QuestionText = "This is my Question";
            PlaceHolder1.Controls.Add(ucSimpleControl);
        }
    }
}

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DynamicUserControl.aspx : -

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DynamicUsercontrol.aspx.cs" Inherits="Testing.DynamicUsercontrol" %>
<%@ Register TagPrefix="uc" TagName="QuestionT1" Src="QuestionType1.ascx" %>
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="cmdAdd" runat="server" Text="Add user control" OnClick="cmdAdd_Click" />
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
        <br />
        My return:
        <asp:Label ID="lblReturn" runat="server" Text="Label"></asp:Label>
    </div>
    </form>
</body>
</html>

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QuestionType1.ascx.cs : -

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Testing
{
    public partial class QuestionType1 : System.Web.UI.UserControl
    {

        string PassResult;

        public string MyResult
        {
            get { return PassResult; }
            //set { PassResult = value; }
        }

        public string QuestionText { get; set; }
       // public String MyResult { get; set; }


        protected void Page_Load(object sender, EventArgs e)
        {
            lblText.Text = QuestionText.ToString();
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            PassResult = "Ive passed";
            
        }
    }
}

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QuestionType1.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="QuestionType1.ascx.cs" Inherits="Testing.QuestionType1" %>
<p>
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Pass" />
    Question type 1
    <asp:Label ID="lblText" runat="server" Text="Label"></asp:Label>
</p>

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Many thanks
Lee

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