我一直试图找出我的后端脚本的问题了一天，它一直有点令人沮丧。基本上，后端脚本没有从我的网页上的下拉列表中抓取数据。它可以在按下按钮时注册，并可以保存到SQL数据库，但它不会抓取下拉列表中的数据。像“部门1”我试过几种方法，但似乎总是空白。
我在网页上有一个按钮和两个下拉唐斯，由以下人员发起：

<form id="form1" runat="server">
                <label for="department">Department:<span class="required">*</span></label>
                <asp:DropDownList ID="departmentDropDown" runat="server" EnableViewState="true" required></asp:DropDownList>

                <label for="partNumber">Part Number:<span class="required">*</span></label>
                <asp:DropDownList ID="partNumberDropDown" runat="server" required></asp:DropDownList>

                <asp:Button runat="server" ID="myButton" Text="Click me" OnClick="myButton_Click" />
            </form>

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我有一个后端：

protected void myButton_Click(object sender, EventArgs e)
    {
        // Get selected values from dropdowns
        string selectedDepartment = departmentDropDown.SelectedValue;
        string selectedPartNumber = partNumberDropDown.SelectedValue;

        // Write the selected values to the response
        Response.Write("Selected Department:" +  selectedDepartment + "<br/>");
        Response.Write("sent by:" +  sender + "<br/>");
        Response.Write("sent by:" +  sender + "<br/>");
        Response.Write("Selected Part Number: "+ selectedPartNumber+ "<br/>");

        Response.Write("<br/> NOT SAVED!");
    }

型
我一直在尝试从后端的几个不同的React，看看发生了什么事，但它似乎总是做同样的事情。我很想使这一工作！
我目前如何填充下拉列表：

protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
        }
        PopulateDepartmentDropdown();
        PopulatePartNumberDropdown();
    }

    private void PopulateDepartmentDropdown()
    {
        // Replace this with your logic to fetch department data from a data source
        DataTable departmentData = GetStaticDepartmentsData();
        //DataTable departmentData = GetDepartmentsData();

        // Clear existing items in the dropdown
        departmentDropDown.Items.Clear();

        // Add an initial blank item if needed
        departmentDropDown.Items.Add(new ListItem("-- Select Department --", ""));

        // Add items to the dropdown from the DataTable
        foreach (DataRow row in departmentData.Rows)
        {
            // Assuming that 'DepartmentIDColumn' and 'DepartmentNameColumn' are column names in your DataTable
            string departmentID = row["department"].ToString();
            string departmentName = row["department"].ToString();

            departmentDropDown.Items.Add(new ListItem(departmentName, departmentID));
        }
    }

    private void PopulatePartNumberDropdown()
    {
        // Replace this with your logic to fetch part number data from a data source
        //DataTable partNumberData = GetPartNumbersData();
        DataTable partNumberData = GetStaticPartNumbersData();

        // Clear existing items in the dropdown
        partNumberDropDown.Items.Clear();

        // Add an initial blank item if needed
        partNumberDropDown.Items.Add(new ListItem("-- Select Part Number --", ""));

        // Add items to the dropdown from the DataTable
        foreach (DataRow row in partNumberData.Rows)
        {
            // Assuming that 'PartNumberIDColumn' and 'PartNumberNameColumn' are column names in your DataTable
            string partNumberID = row["partnumbers"].ToString();
            string partNumberName = row["partnumbers"].ToString();

            partNumberDropDown.Items.Add(new ListItem(partNumberName, partNumberID));
        }
    }
    private DataTable GetStaticDepartmentsData()
    {
        DataTable departmentsData = new DataTable();
        departmentsData.Columns.Add("department");

        // Add static department data
        departmentsData.Rows.Add("DepartmentA");
        departmentsData.Rows.Add("DepartmentB");
        departmentsData.Rows.Add("DepartmentC");

        return departmentsData;
    }
    
    private DataTable GetStaticPartNumbersData()
    {
        DataTable partNumbersData = new DataTable();
        partNumbersData.Columns.Add("partnumbers");

        // Add static part number data
        partNumbersData.Rows.Add("12345");
        partNumbersData.Rows.Add("67890");
        partNumbersData.Rows.Add("ABCDE");

        return partNumbersData;
    }

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