ModalPopUp不隐藏按钮点击

使用RadioButtonList来选择输入数据的选项，其中之一是AJAX ModalPopUp中的gridview。当用户单击ModalPopUp中的按钮时，ModalPopUp需要隐藏。在这一点不起作用，尽管它在一个点上。代码如下所示。我认为这是一件简单的事情，我忽略了，但我已经看过很多其他的帖子，没有成功:

RadioButtonList:

<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
  <asp:ListItem Selected="True">Manual Entry (separate with semi-colons)</asp:ListItem>
  <asp:ListItem>Artists Only</asp:ListItem>
  <asp:ListItem>Clients Only</asp:ListItem>
  <asp:ListItem>Test with a gridview</asp:ListItem>
 </asp:RadioButtonList>

Gridview in ModalPopUp:

<asp:UpdatePanel runat="server">
  <ContentTemplate>
    <asp:HiddenField runat="server" ID="ModalHidden" />
      <ajax:ModalPopupExtender ID="George" runat="server" TargetControlID="ModalHidden" PopupControlID="PopUpPanel" DropShadow="true" CancelControlID="btnCancel" PopupDragHandleControlID="Select Emails" Drag="true">
      </ajax:ModalPopupExtender>
      <br>
      </br>
      <br>
      </br>
      <asp:Panel ID="PopUpPanel" runat="server" BorderColor="Black" BackColor="LightGray" BorderStyle="Solid" BorderWidth="10px">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="SqlDataSource3">
          <rowstyle backcolor="LightCyan" forecolor="DarkBlue" font-italic="true"/>
            <alternatingrowstyle backcolor="PaleTurquoise" forecolor="DarkBlue" font-italic="true"/>      
              <Columns>
                <asp:TemplateField>
                  <ItemTemplate>
                    <asp:CheckBox ID="ckboxGridview" runat="server"></asp:CheckBox>
                  </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="True" SortExpression="Id" Visible="false"/>
                <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
                <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
                <asp:BoundField DataField="EmailAddress" HeaderText="EmailAddress" SortExpression="EmailAddress" />
            </Columns>
          </asp:GridView>
          <br>
          </br>
          <asp:Button ID="btnSelectGVAddresses" runat="server" Text="Select Addresses" OnClick="btnOK_Click" />
          <asp:Button ID="btnCancel" runat="server" Text="Cancel" />
          <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:C:'........ %>" SelectCommand="SELECT * FROM [tbl_Op_Recipients]"></asp:SqlDataSource>
        </asp:Panel>
        <br>
        </br>
      </ContentTemplate>
    </asp:UpdatePanel>

RadioButtonList的后台代码:

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
    TextBox temp_sent = frmSendEmail.FindControl("sent_toTextBox") as TextBox;
    RadioButtonList temp_radio = frmSendEmail.FindControl("RadioButtonList1")
as RadioButtonList;
    if (temp_radio.SelectedItem.Text == "Artists Only")
    {
        temp_sent.Text = "All Artists";
        frmSendEmail.FindControl("EmailAddressesForEmail").Visible = false;
        frmSendEmail.FindControl("PopUpPanel").Visible = false;
        string sqlquery = @"SELECT EmailAddress, ISNULL(FirstName, 'Artist') AS           EmailName FROM tbl_Op_Recipients WHERE EmailAddress IS NOT NULL AND UserType = 'A'";
        gather_emails(sqlquery);
    }
    if (temp_radio.SelectedItem.Text == "Clients Only")
    {
        temp_sent.Text = "All Clients";
        frmSendEmail.FindControl("EmailAddressesForEmail").Visible = false;
        frmSendEmail.FindControl("PopUpPanel").Visible = false;  
        string sqlquery = @"SELECT EmailAddress, ISNULL(FirstName, 'Client') AS     EmailName FROM tbl_Op_Recipients WHERE EmailAddress IS NOT NULL AND UserType = 'C'";
        gather_emails(sqlquery);
    }
    if (temp_radio.SelectedItem.Text == "Manual Entry (separate with semi-colons)")
    {
        frmSendEmail.FindControl("EmailAddressesForEmail").Visible = true;
        temp_sent.Text = "Enter Names and Emails Manually";
        frmSendEmail.FindControl("PopUpPanel").Visible = false;  

    }

    if (temp_radio.SelectedItem.Text == "Test with a gridview")
    {
        temp_sent.Text = "Select multiple items from popup";
        frmSendEmail.FindControl("EmailAddressesForEmail").Visible = false;
        frmSendEmail.FindControl("PopUpPanel").Visible = true;
        ModalPopupExtender test = frmSendEmail.FindControl("George") as     ModalPopupExtender;
        test.Show();
        Response.Write("breakpoint 291");
    }

    if (temp_radio.SelectedItem.Text == null )
        temp_radio.Text = "";


}

Gridview (hide modalpopup)的代码:

protected void btnOK_Click(object sender, EventArgs e)
{
    Panel PanelTemp = frmSendEmail.FindControl("PopUpPanel") as Panel;
    PanelTemp.Visible = false;
    RadioButtonList tempRadioButton = frmSendEmail.FindControl("RadioButtonList1") as     RadioButtonList;
    tempRadioButton.Items[0].Selected = true;

    ModalPopupExtender PopUpTemp = frmSendEmail.FindControl("George") as ModalPopupExtender;
    PopUpTemp.Hide();

    GridView GVTemp = frmSendEmail.FindControl("Gridview1") as GridView;
    var list = new List<EmailAddresses>();
    foreach(GridViewRow row in GVTemp.Rows)
    {
        CheckBox ChkBoxtmp = row.FindControl("ckboxGridview") as CheckBox;
        if(ChkBoxtmp.Checked)
        {

        list.Add(new EmailAddresses { EmailAddress = row.Cells[4].Text, FirstNames = row.Cells[2].Text });
        }
    }
    EmailAddresses[] allRecords = list.ToArray();

    btnSend_Click(allRecords);
}