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逻辑代码:using Systemusing System.Configurationusing System.Datausing System.Linqusing System.Webusing System.Web.Securityusing System.Web.UIusing System.Web.UI.HtmlControlsusing System.Web.UI.WebControlsusing System.Web.UI.WebControls.WebPartsusing System.Xml.Linqpublic partial class _Default : System.Web.UI.Page protected void Page_Loadobject sender EventArgs e if IsPostBack BindYear BindMonth BindDay BindYear1 BindMonth1 BindDay1 BindYear2 BindMonth2 BindDay2 if IsPostBack Panel2.Visible true Panel3.Visible false protected void BindYear ddlYear.Items.Clear int startYear DateTime.Now.Year - 20 int currentYear DateTime.Now.Year for int i startYear i lt currentYear i ddlYear.Items.Addnew ListItemi.ToString ddlYear.SelectedValue currentYear.ToStringprotected void BindMonth ddlMonth.Items.Clear for int i 1 i lt 12 i ddlMonth.Items.Addi.ToString protected void BindDay ddlDay.Items.Clear string year ddlYear.SelectedValue string month ddlMonth.SelectedValue int days DateTime.DaysInMonthint.Parseyear int.Parsemonth for int i 1 i lt days i ddlDay.Items.Addi.ToString protected void ddlYear_SelectedIndexChangedobject sender EventArgs e BindDayprotected void ddlMonth_SelectedIndexChangedobject sender EventArgs e BindDayprotected void BindYear1 ddlYear1.Items.Clear int startYear DateTime.Now.Year - 20 int currentYear DateTime.Now.Year for int i startYear i lt currentYear i ddlYear1.Items.Addnew ListItemi.ToString ddlYear1.SelectedValue currentYear.ToStringprotected void BindMonth1 ddlMonth1.Items.Clear for int i 1 i lt 12 i ddlMonth1.Items.Addi.ToString protected void BindDay1 ddlDay1.Items.Clear string year ddlYear1.SelectedValue string month ddlMonth1.SelectedValue int days DateTime.DaysInMonthint.Parseyear int.Parsemonth for int i 1 i lt days i ddlDay1.Items.Addi.ToString protected void ddlYear1_SelectedIndexChangedobject sender EventArgs e BindDay1protected void ddlMonth1_SelectedIndexChangedobject sender EventArgs e BindDay1protected void BindYear2 ddlYear2.Items.Clear int startYear DateTime.Now.Year - 20 int currentYear DateTime.Now.Year for int i startYear i lt currentYear i ddlYear2.Items.Addnew ListItemi.ToString ddlYear2.SelectedValue currentYear.ToStringprotected void BindMonth2 ddlMonth2.Items.Clear for int i 1 i lt 12 i ddlMonth2.Items.Addi.ToString protected void BindDay2 ddlDay2.Items.Clear string year ddlYear2.SelectedValue string month ddlMonth2.SelectedValue int days DateTime.DaysInMonthint.Parseyear int.Parsemonth for int i 1 i lt days i ddlDay2.Items.Addi.ToString protected void ddlYear2_SelectedIndexChangedobject sender EventArgs e BindDay2protected void ddlMonth2_SelectedIndexChangedobject sender EventArgs e BindDay2protected void DropDownList9_SelectedIndexChangedobject sender EventArgs e if DropDownList9.SelectedIndex 1 DropDownList10.Items.Clear DropDownList10.Items.Addquot数学系quot DropDownList10.Items.Addquot计算机系quot if DropDownList9.SelectedIndex 2 DropDownList10.Items.Clear DropDownList10.Items.Addquot旅游管理系quot DropDownList10.Items.Addquot酒店管理系quot if DropDownList9.SelectedIndex 3 DropDownList10.Items.Clear DropDownList10.Items.Addquot英语系quot DropDownList10.Items.Addquot日语系quot protected void DropDownList10_SelectedIndexChangedobject sender EventArgs e if DropDownList10.SelectedValue quot数学系quot DropDownList11.Items.Clear DropDownList11.Items.Addquot数学专业quot if DropDownList10.SelectedValue quot计算机系quot DropDownList11.Items.Clear DropDownList11.Items.Addquot网络专业quot DropDownList11.Items.Addquot软件专业quot if DropDownList10.SelectedValue quot旅游管理系quot DropDownList11.Items.Clear DropDownList11.Items.Addquot旅游管理专业quot if DropDownList1