asp.net - Button is inside update panel. but every button click full page postback

Question

In my code for every droup down is in update panel.it is not postback. for every button click full postback is occure. but my buttons are in update panel.i tried in trigger asynpostback, in that case server side message is not displayed. i want that msg also.

my code is:

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <table align="center" style="border: thin solid #FF0000" width="80%">
        <tr>
            <th colspan="2" align="center" bgcolor="Black" style="color: #FFFFFF">
                Schedule New Batch
            </th>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <div>
                    <asp:Label ID="lblError" runat="server" Style="font-weight: 700; color: #FF0000;"
                        Text="Label" Visible="False"></asp:Label>
                    <asp:Label ID="lblSucess" runat="server" Style="font-weight: 700; color: #006600;
                        background-color: #FFFFFF;" Text="Label" Visible="False"></asp:Label>
                </div>
            </td>
        </tr>
        <tr>
            <td colspan="2">
                &nbsp;
            </td>
        </tr>
        <tr>
            <td class="style44" align="right">
                Technology<span class="style23">*</span> :
            </td>
            <td class="style45">
                <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                    <ContentTemplate>
                        <asp:DropDownList ID="ddlTechnology" runat="server" Width="155px" Class="valid" OnSelectedIndexChanged="ddlTechnology_SelectedIndexChanged"
                            AutoPostBack="True" Height="23px">
                        </asp:DropDownList>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td class="style49" align="right">
                Courses<span class="style23">*</span> :
            </td>
            <td class="style50">
                <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                    <ContentTemplate>
                        <asp:DropDownList ID="ddlCourse" runat="server" Width="155px" Class="valid" OnSelectedIndexChanged="ddlCourse_SelectedIndexChanged"
                            AutoPostBack="True" Height="23px">
                        </asp:DropDownList>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td class="style9" align="right">
                Faculty<span class="style23">*</span> :
            </td>
            <td class="style47">
                <asp:UpdatePanel ID="UpdatePanel3" runat="server">
                    <ContentTemplate>
                        <asp:DropDownList ID="ddlFaculty" runat="server" Width="155px" Class="valid" OnSelectedIndexChanged="ddlFaculty_SelectedIndexChanged"
                            AutoPostBack="True" Height="23px">
                        </asp:DropDownList>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td class="style44" align="right">
                Timing<span class="style24">*</span> :
            </td>
            <td class="style45">
                <asp:UpdatePanel ID="UpdatePanel4" runat="server">
                    <ContentTemplate>
                        <asp:DropDownList ID="ddlTiming" runat="server" Width="155px" Height="23px" AutoPostBack="True"
                            Class="valid" OnSelectedIndexChanged="ddlTiming_SelectedIndexChanged">
                        </asp:DropDownList>
                        <asp:Button ID="btnAdd" runat="server" Text="Add" />
                        <cc1:modalpopupextender id="btnAdd_ModalPopupExtender" runat="server" cancelcontrolid="btnCancleInsertTime"
                            dynamicservicepath="" enabled="True" popupcontrolid="Panel1" targetcontrolid="btnAdd">
                    </cc1:modalpopupextender>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td class="style44" align="right">
                Start Date<span class="style23">*</span> :
            </td>
            <td class="style45">
                <asp:UpdatePanel ID="UpdatePanel6" runat="server">
                    <ContentTemplate>
                        <asp:TextBox ID="txtInsertdate" runat="server" Width="150px" Height="16px" Class="valid"></asp:TextBox>
                        <cc1:calendarextender id="CalendarExtender1" runat="server" targetcontrolid="txtInsertdate"
                            format="yyyy-MM-dd">
                    </cc1:calendarextender>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td class="style51">
                &nbsp;
            </td>
            <td class="style45">
                &nbsp;
            </td>
        </tr>
        <tr>
            <td>
                <div style="text-align: right">
                    <asp:Button ID="btnSchedule" runat="server" Text="Schedule" Style="font-weight: 700;
                        margin-left: 0px;" Width="81px" Height="24px" OnClick="btnSchedule_Click" />
                </div>
            </td>
            <td>
                <asp:UpdatePanel ID="UpdatePanel5" runat="server">
                    <ContentTemplate>
                        <asp:Button ID="btnreset" runat="server" OnClick="btnreset_Click" Style="font-weight: 700"
                            Text="Reset" Width="67px" CausesValidation="False" UseSubmitBehavior="false" />
                    </ContentTemplate>
                    <Triggers>
                        <asp:PostBackTrigger ControlID="btnreset" />
                    </Triggers>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td colspan="3">
                <asp:Panel ID="Panel1" runat="server" aline="center">
                    <table style="border: thin solid #FF0000; background: #7F8778">
                        <tr>
                            <th class="style53">
                                Please Add a Time
                            </th>
                        </tr>
                        <tr>
                            <td align="center" style="color: #FF0000" class="style53">
                                <asp:TextBox ID="txtInsertTime" runat="server" Width="124px"></asp:TextBox>
                                &nbsp; EX: 09:15AM
                            </td>
                        </tr>
                        <tr>
                            <asp:UpdatePanel ID="UpdatePanel7" runat="server" UpdateMode="Conditional">
                                <ContentTemplate>
                                    <td align="center" class="style53">
                                        <asp:Button ID="btnInsertTime" runat="server" Text="Add Time" Width="73px" OnClientClick="return InsertTime()"
                                            OnClick="btnInsertTime_Click" class="cancel" />
                                        &nbsp; &nbsp;
                                        <asp:Button ID="btnCancleInsertTime" Text="Cancel" Width="55px" runat="server" class="cancel" />
                                    </td>
                                </ContentTemplate>
                            </asp:UpdatePanel>
                        </tr>
                    </table>
                </asp:Panel>
            </td>
        </tr>
    </table>
    <br />
    </form>
</asp:Content>

Answer 1

次のように、そのコントロールをスクリプトマネージャーに登録してみてください。

protected void Page_Load(object sender, EventArgs e)
{
  ScriptManager1.RegisterAsyncPostBackControl(ddlTechnology);
  ScriptManager1.RegisterAsyncPostBackControl(ddlCourse);
}