unable to take value of Dynamic Created Label

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ASP.NET

I use This Code at Aspx:

<asp:Button ID="BtnAdd" runat="server" Text="Add" onclick="BtnAdd_Click"  />

       <asp:Button ID="BtnTake" runat="server" Text="TakeValue"
           onclick="BtnTake_Click"  />

       <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

       <asp:Panel ID="Panel1" runat="server">

       </asp:Panel>

And At aspx.cs:

protected void BtnAdd_Click(object sender, EventArgs e)
    {
        Label lbl = new Label();
        lbl.ID = "Lbl1";
        lbl.Text = "Arun";
        Panel1.Controls.Add(lbl);
    }
    protected void BtnTake_Click(object sender, EventArgs e)
    {
        string lblName = "Lbl1";
        //Label Lbl = Panel1.FindControl(lblName) as Label;
        Label Lbl = (Label)Panel1.FindControl(lblName);
        TextBox1.Text = Lbl.Text; 
    }

When i click add button i easily create one Dynamic label,

but when i click on second button(take value)

Then it generated An error: like this:

Object reference not set to an instance of an object.

when i try Break point then i see that After click on button 2,

Label Lbl = (Label)Panel1.FindControl(lblName);

lbl return Null:

So what can i do for taking that dynemic created lables values