C＃ - 由DropDownList打开的ModalPopupExtender

Question

在找到类似问题的同时，我还没有找到答案让我想到的地方。

我有一个ModalPopupExtender，我已经链接到一个填充了Job #s的DropDownList。当我从列表中选择一个作业时，我希望面板出现。但是，如果我第二次单击下拉列表（在选择了一个作业之后），Panel将按预期显示，并填充数据，这不会发生。

以下是aspx中的相关代码：

<Ajax:ModalPopupExtender ID="NonImportedPopupExtender" runat="server"  
    OkControlID="ImportButton"
    TargetControlID="NonImportedDetailDropDownList" 
    CancelControlID="CancelButton" 
    OnCancelScript="PopupCancel()" 
    OnOkScript="NonImportedModalPopupDoUpdate()"
    PopupControlID="NonImportedPopupPanel" />
<asp:Panel ID="NonImportedPopupPanel" runat="server" Width="600" Height="350">
    <br />
    <asp:Label ID="NotImportedLabel" runat="server" Text="NonImported Job Detail:"></asp:Label>
    <br />
    <asp:Repeater ID="NonImportedDetailRepeater" runat="server"
    >
        <HeaderTemplate>
            <table width="450">
                <tr>
                    <th>TSID</th>
                    <th>PKey</th>
                    <th>EID</th>
                    <th>Name</th>
                    <th>ST Hrs</th>
                    <th>OT Hrs</th>
                    <th>BIT</th>
                    <th>Vision</th>
                    <th>Imported</th>
                </tr>
        </HeaderTemplate>
        <ItemTemplate>
                <tr>
                    <td><%# Eval("TimesheetID") %></td>
                    <td><%# Eval("PKey") %></td>
                    <td><%# Eval("Employee") %></td>
                    <td><%# Eval("Name") %></td>
                    <td><%# Eval("RegHrs") %></td>
                    <td><%# Eval("OvtHrs") %></td>
                    <td><%# Eval("BIT_Directive") %></td>
                    <td><%# Eval("VisionStatus") %></td>
                    <td><%# Eval("Completed") %></td>
                </tr>
        </ItemTemplate>
        <FooterTemplate>
            </table>
        </FooterTemplate>
    </asp:Repeater>
    <asp:Button ID="ImportButton" runat="server" Text="Set As Imported" Visible="false" />
    <asp:Button ID="CancelButton" runat="server" Text="Cancel" Visible="false" />
</asp:Panel>

以下是下拉列表的索引更改：

protected void NonImportedDetailDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
    try
    {
        string myJob = this.NonImportedDetailDropDownList.SelectedValue.ToString();
        NonImportedPopupPanel.Visible = true;

        if (myJob != null)
        {

            SqlConnection myConn = new SqlConnection(ConfigurationManager.ConnectionStrings["InterfaceDev"].ConnectionString);
            string myCommandText = "BillingDirectives_ShowNonImportedByJob";
            SqlCommand myCommand = new SqlCommand(myCommandText, myConn);
            myCommand.CommandType = CommandType.StoredProcedure;
            myCommand.Parameters.AddWithValue("@Job", myJob);
            SqlDataAdapter myDataAdapter = new SqlDataAdapter(myCommand);
            DataSet myDataSet = new DataSet();
            myDataAdapter.Fill(myDataSet);
            DataTable myDataTable = myDataSet.Tables[0];
            NonImportedDetailRepeater.DataSource = myDataTable;
            NonImportedDetailRepeater.DataBind();
            CancelButton.Visible = true;
            ImportButton.Visible = true;
        }
        else
        {
            WarningLabel.ForeColor = System.Drawing.Color.Red;
            WarningLabel.Text = "Cannot determine selected Job #!";
        }
    }
    catch (SqlException ex)
    {
        WarningLabel.ForeColor = System.Drawing.Color.Red;
        WarningLabel.Text = "SQL Error: " + ex.Message.ToString();
    }
    finally
    {
        //GridView1.DataBind();
    }
}

以下是DDL - Adam的问题：

    <div>
        <asp:Label ID="NonImportedLabel" runat="server" Text="Show NonImported Detail:"></asp:Label>
        <br />
        <asp:DropDownList ID="NonImportedDetailDropDownList" runat="server" 
            Width="140" 
            ToolTip="Show NonImported Detail by Job"
            OnSelectedIndexChanged="NonImportedDetailDropDownList_SelectedIndexChanged"
            AutoPostBack="True">
        </asp:DropDownList>
    </div>