Ajax Modal Popup Extender Button Click Problem

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C#

ASP.NET

Ajax

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Hi

I am using Modal Popup Extender with Asp.net c#. My popup include a button and a textbox. I join a string in my textbox then click the button and save to my database. But i have a problem.

When i click the button, textbox value must transfer to another textbox that is in aspx file. But it doesn't work. Here is my code:

aspx.cs file:

protected void BtnAddProject_Click(object sender, EventArgs e)
        {
            TxtProject.Text = TxtNewProject.Text; // txtproject in aspx file, txtnewproject in modal popup
            InsertUpdateDelete add = new InsertUpdateDelete();
            add.InsertProject(TxtNewProject.Text);
        }

aspx file:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:Button ID="BtnShowProject" runat="server" Text="Show" OnClick="BtnShowProject_Click" Style="display: none;" />
                <asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="BtnShowProject" PopupControlID="PnlCustomerInsert">
                </asp:ModalPopupExtender>
                <asp:Panel ID="PnlCustomerInsert" runat="server" BackColor="Silver" Width="300px" Height="300px" Style="display: none;">
                    <asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
                        <ContentTemplate>
                            <asp:Button ID="BtnHideProject" runat="server" Text="Kapat" OnClick="BtnHideProject_Click" Style="text-align: right" />
                            <asp:Label ID="Label14" runat="server" Text="Kurum Adı:"></asp:Label>
                            <asp:TextBox ID="TxtNewProject" runat="server" ></asp:TextBox>
                            <asp:Button ID="BtnAddProject" runat="server" Text="Ekle" OnClick="BtnAddProject_Click" />
                        </ContentTemplate>
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="BtnHideProject" EventName="Click" />
                            <asp:AsyncPostBackTrigger ControlID="TxtProject" />
                        </Triggers>
                    </asp:UpdatePanel>
                </asp:Panel>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="BtnShowProject" EventName="Click" />
            </Triggers>
        </asp:UpdatePanel>