ASP Dropdown Passing Databound selection value

Hi,

I have created an ASP dropdown, and used the wizard to bind the data to the list.  Now, I want to pass the result back so that I may use it in the codebehind, but I dont know how to do this.

See my aspx code here:  My Codebehind is attached below.  I need to pass the selection in the "Submit" function.

<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
        DataTextField="FullName" DataValueField="Personel_ID" Height="27px"
        Width="218px" AutoPostBack="True"
        onselectedindexchanged="DropDownList1_SelectedIndexChanged"
        AppendDataBoundItems="True">
<asp:ListItem Text="(All)" Value="defaultValue" Selected="true"></asp:ListItem>

</asp:DropDownList>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="ConnectionString">
    </asp:SqlDataSource>

protected void submit(object sender, EventArgs e)
        {
            Class1 c1 = new Class1();
            DateTime FromDate= DateTime.Parse(Request.Form[TextBox1.UniqueID]);
            DateTime toDate = DateTime.Parse(Request.Form[TextBox2.UniqueID]);
            
            
            IDataReader reader = c1.getData(FromDate, toDate, FullName);
             GridView1.DataSource = reader;
             GridView1.DataBind();

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