C# 下拉列表和RadioButton列表选择已更改事件处理

我有一个单选按钮列表和一个下拉列表，我处理了两个事件RBtypeof user_SelectedIndexChanged和DDLContrich_SelectedIndexChanged。对于这两个控件，我已将autoPostBack设置为true

但在单击单选按钮列表时，我的两个事件，即rbTypeOfUser_SelectedIndexChanged和ddlCountry_SelectedIndexChanged都会得到处理，而ddlCountry_SelectedIndexChanged不会在下拉选择更改时得到处理

有什么问题吗

protected void rbTypeOfUser_SelectedIndexChanged(object sender, EventArgs e)
    {
        //ViewState["TypeOfUser"] = rbTypeOfUser.SelectedItem.ToString();
        if (rbTypeOfUser.SelectedValue == "Free")
        {
            trmembership.Visible = false;
            //DDLMembershipPlan.Visible = false;
        }
        else
        {
            trmembership.Visible = true;
            //DDLMembershipPlan.Visible = true;
            //Label8.Visible = true;
            MembershipPlan();
        }

    }

protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
    {
        Parameterised_SQL_Dentry pm = new Parameterised_SQL_Dentry(0,   CommonStrings.ConnectionString);

        //Dentry de=new Dentry();
        string strState = "select vcrState,intState_id from exp_mst_state where intCountry_id='" + ddlCountry.SelectedValue + "' order by vcrState ";

        //de.FillCombo(ddlState,strState,"vcrState","intState_id");
        pm.FillCombo(ddlState, strState, "vcrState", "intState_id");
        ddlState.DataBind();
         ddlState.Enabled = true;
        ddlState.Items.Insert(0, new ListItem("Select State", "0"));

    }


<asp:RadioButtonList align="Center"  ID="rbTypeOfUser" runat="server"     RepeatDirection="Horizontal"  Width="350px" AutoPostBack="True"  onselectedindexchanged="rbTypeOfUser_SelectedIndexChanged" CssClass="checkbox_padd" TabIndex="1"  >
<asp:ListItem   Value="Free" Selected="True"><span class="mmovehead">&lt;span class=&quot;mmovehead&quot;&gt;Free&lt;/span&gt;</span></asp:ListItem>
<asp:ListItem  Value="Paid"><span class="mmovehead">&lt;span 

class=mmovehead>Paid

---

你试过在ddlCountry处理程序中设置断点吗？是的，只有我知道这一点。你能发布你的aspx吗？请看一下它不工作。在里面ispostback我的代码将只执行一次。但我想在每次为ddlcountry更改选择时更改另一个下拉列表，正如您在我的代码中看到的那样。

<asp:DropDownList ID="ddlCountry" runat="server" AutoPostBack="True"   ValidationGroup="Registration" Width="300px" TabIndex="3" onselectedindexchanged="ddlCountry_SelectedIndexChanged"  >
</asp:DropDownList>