js弹出提示框的问题

Question

    protected void BtnUpdate_Click(object sender, EventArgs e)
    {
        SaveImgeName();
        string proName = this.TxtProductsName.Text.Trim();       //商品名称
        int parID = Convert.ToInt32(this.TxtID.Text.Trim());
        decimal proPriceA = Convert.ToDecimal(this.TxtProductsPriceA.Text.Trim());      //雅湾价格
        DateTime proDate = Convert.ToDateTime(this.TxtDate.Text.Trim());
        string re = this.TxtRe.Text.Trim();      //标签
        string particular = this.FCKeditor1.Value;       //详细介绍        string summary = this.TxtSummary.Text.Trim();    //商品摘要
        int grade = this.level.SelectedIndex;        //商品的星级
        int pinpaiID = Convert.ToInt32(this.ddl_pinpai.SelectedValue.ToString());
        string[] keyWords = this.TxtKeyWords.Text.Replace("　"," ").Split(' ');    //商品的关键字
        if (this.TxtID.Text == "0" || this.TxtID.Text.Trim() == "")
        {
            Response.Write("<script>alert('请修改类别')</script>");
            这里，满足条件就是不弹提示框！谁能指点下，谢谢！~
        }
        int isHot = 0;
        int isNew = 0;
        int iSuggest = 0;   //强力推荐
        int isLowPrice = 0; //低价促销
        int isearch = 0;
        if (this.ChkHot.Checked)
        {
            isHot = 1;      //热销产品
        }
        if (this.ChkNew.Checked)
        {
            isNew = 1;     //新品
        }
        if (this.ChkSuggest.Checked)
        {
            iSuggest = 1;      //强力推荐
        }
        if (this.ChkLowPrice.Checked)
        {
            isLowPrice = 1;     //低价促销
        }
        if (this.ChkSearch.Checked)
        {
            isearch = 1;     //搜索推荐
        }
        string newNames = "";          //6张商品展示图片的名字
        if (ViewState["ImgeA"] != null)
        {            newNames = ViewState["ImgeA"].ToString();
            //Response.Write(newNames);
            //Response.End();
        }
        if (newNames == "")
            newNames = "noimg.gif";
        int updateID=this.RequestPar();        ProDB updatePro = new ProDB();    //实例化商品类
        //修改商品
        updatePro.Pro_Data.IsTran = true;  //开始事务
        string[] oldKeys = null;         //关键字修改前ID的数组
        if (ViewState["oldKeys"] != null)
        {
            oldKeys = ViewState["oldKeys"].ToString().Split(' ');
        }
        CategoryClass cate = new CategoryClass();
        try
        {
            updatePro.Update_Pro(updateID, proName, parID, proPriceA,proDate, newNames, grade, re, summary, particular, isHot, isNew,iSuggest,isLowPrice, isearch,pinpaiID);            try
            {
                //if (this.TxtKeyWords.Text != "")
                //{
                //    updatePro.DeleteKeys(updateID);
                //}
                DataSet dst = updatePro.SelIdByProID(updateID);
                if (dst.Tables[0].Rows.Count > 0)
                {
                    for (int i = 0; i < dst.Tables[0].Rows.Count; i++)
                    {
                        updatePro.DeleteKeys(Convert.ToInt32(dst.Tables[0].Rows[i]["Id"].ToString()));
                        cate.UpCount(Convert.ToInt32(dst.Tables[0].Rows[i]["Tag"].ToString()),-1);
                    }
                }
                foreach (string keys in keyWords)
                {
                    if (keys != "")
                    {
                        DataSet ds = cate.GetCateIDByName(keys);
                        if (ds.Tables[0].Rows.Count == 1)
                        {
                            string key = ds.Tables[0].Rows[0][0].ToString();
                            updatePro.Add_Key(updateID, key);
                            cate.UpCount(Convert.ToInt32(key), 1);
                        }
                        else
                        {
                            updatePro.Add_Key(updateID, keys);    //添加商品的关键字
                        }
                        
                    }
                }
            }
            catch
            {
                RegisterStartupScript("alert", "<script language=javascript>alert('添加失败！')</script>");
            }
            
            if (ViewState["ID"].ToString() != parID.ToString())
            {
                cate.UpCount(parID, 1);
                cate.UpCount(Convert.ToInt32(ViewState["ID"]), -1);
            }            updatePro.Pro_Data.TranCommit();  //提交事务
            updatePro.Pro_Data.IsTran = false;    //事务完成
            Response.Redirect("~/WebMain/Manage/Shop/UpdateSuccess.aspx");
        }
        catch
        {
            updatePro.Pro_Data.TranRollBack();    //事务回滚
            RegisterStartupScript("alert", "<script language=javascript>alert('修改失败！')</script>");
        }
    }

Answer 1

不弹提示框就不要用alert不就行了

Answer 2

Page.RegisterClientScriptBlock("a","<script language='javascript'>alert('请修改类别')</script>;");

Answer 3

Page.RegisterClientScriptBlock("a"," <script language='javascript'>alert('请修改类别') </script>;");

Answer 4

Response.Write("<script language='javascript'>alert('你错了');</script>")

Answer 5

return 好使 ok 散分！~谢谢