asp.net在代码隐藏中读取客户端下拉列表值

Question

So I have two dropdown controls, the second one (the data comes from a JSON file) is filled depending on the value of the first dropdown:

<asp:DropDownList runat="server" ID="task1DD"/>
<asp:DropDownList runat="server" ID="task2DD"/>

In the code behind I used an override render method to accept the client's data:

    protected override void Render(HtmlTextWriter writer)
    {
        ClientScript.RegisterForEventValidation(task2DD.UniqueID,"text_from_dd");
        ClientScript.RegisterForEventValidation(task2DD.UniqueID,"text_from_dd");
        ...
        base.Render(writer);
    }

Now when I tried to read the value from the second Dropdown:

task2DD.Text

I don't get nothing, like the variable is empty. Are there other steps that I need to do in order to read the data that was filled in the client?

Answer 1

Use the following to get the display text of what is selected

task2DD.SelectedItem.Text;

and the following to get the value

task2DD.SelectedValue;