asp：按钮单击fires dropdownlist事件

Question

我有一个带有postback = true属性的dropdownlist，它有selectedindexchange事件，我也有onClick事件的按钮。问题是按钮点击触发我的下拉列表事件，我不想要它。 在selectedindexchange中我有一些删除查询，它与按钮点击事件代码无关。

这是我的databind下拉列表：

 <asp:dropdownlist ID="DropDownList1"  EnableViewState="true"   AutoPostBack="true" runat="server"  DataSourceID="SqlDataSource1" Width="200"
                        DataTextField="NAME" DataValueField="ID"   OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                    </asp:dropdownlist>

                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:db_conn %>"
                        SelectCommand="SELECT [ID], [NAME] FROM [TABLE] ORDER BY [ID]">
                    </asp:SqlDataSource>

这是按钮点击代码

protected void btnUpdate_Click(object sender, EventArgs e)
{



    IFormatProvider culture = new CultureInfo("en-US");

    SqlParameter[] arp = new SqlParameter[6];



    arp[0] = new SqlParameter("@number", SqlDbType.NChar, 10);
    arp[0].Value = txtNumber.Text;

    arp[1] = new SqlParameter("@date", SqlDbType.SmallDateTime);
    arp[1].Value = Convert.ToDateTime(Date.Value, culture);

    // arp[4] = new SqlParameter("@keywords", SqlDbType.SmallDateTime);
    // arp[4].Value = Convert.ToDateTime(Date.Value, culture);

    int doc_id = 0;
    try
    {
        doc_id = Int32.Parse(hidenDocID.Value);
    }
    catch
    {

    }

    arp[2] = new SqlParameter("@doc_id", SqlDbType.Int);
    arp[2].Value = doc_id;



    arp[3] = new SqlParameter("@text", SqlDbType.NText);
    arp[3].Value = FCKeditor1.Value;


    arp[4] = new SqlParameter("@type_id", SqlDbType.Int);
    arp[4].Value = Int32.Parse(DropDownList1.SelectedValue);



    arp[5] = new SqlParameter("@id", SqlDbType.Int);
    arp[5].Value = Int32.Parse(lawId);

    #endregion


    try
    {
        SqlHelper.ExecuteNonQuery(connString, CommandType.StoredProcedure, "update_document", arp);
        UpdateCategory(Convert.ToInt32(lawId));
    }
    catch (Exception adEx)
    {
        lblMessage.Text = adEx.ToString();

    }

}