求讲解ASP.NET代码

ShipArea.aspx：

public partial class Manger_ShipArea : System.Web.UI.Page
{
    MangerClass mcObj = new MangerClass();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Convert.ToString(Session["AID"]) == "")
        {
            Response.Redirect("Fail.aspx");
        }
        if (!IsPostBack)
        {
            if (this.Request.QueryString["Action"] == "Manage")
            {
                lblAction.Text = "配送地点管理";
                gvAreaBind();
            }
            else if (this.Request.QueryString["Action"] == "Add")
            {
                lblAction.Text = "添加配送地点信息";

            }
            else if (this.Request.QueryString["Action"] == "Modify")
            {
                lblAction.Text = "修改配送地点信息";
                GetAreaInfo();
            }

        }

    }
    public void gvAreaBind()
    {
        DataSet ds = mcObj.ReturnAreaDs("AreaInfo");
        gvArea.DataSource = ds.Tables["AreaInfo"].DefaultView;
        gvArea.DataBind();
    }
    protected void gvArea_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvArea.PageIndex = e.NewPageIndex;
        gvAreaBind();
    }
    protected void gvArea_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int P_Int_AreaID = Convert.ToInt32(gvArea.DataKeys[e.RowIndex].Value.ToString());
        mcObj.DeleteAreaInfo(P_Int_AreaID);
        gvAreaBind();

    }
    public void GetAreaInfo()
    {
        DataSet ds = mcObj.ReturnAreaDsByID(Convert.ToInt32(this.Request["AreaID"].ToString()), "AreaInfo");
        txtName.Text = ds.Tables["AreaInfo"].Rows[0][1].ToString();
        txtKM.Text = ds.Tables["AreaInfo"].Rows[0][2].ToString();

    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        if (this.Request.QueryString["Action"] == "Add")
        {
            if (txtName.Text == ""||txtKM.Text =="")
            {
                Response.Write("<script>alert('请输入完整信息')</script>");
                return;
            }
            else
            {
                if (IsValidInt(txtKM.Text.Trim()) == false)
                {
                    Response.Write("<script>alert('请输入整数！')</script>");
                    return;
                }
                else
                {
                 mcObj.InsertArea(txtName.Text.Trim(),Convert.ToInt32(txtKM.Text.Trim()));
                 Response.Write("<script>alert('插入成功！')</script>");
                 return;
                }

              
            }

        }
        else if (this.Request.QueryString["Action"] == "Modify")
        {

            if (txtName.Text == ""||txtKM.Text=="")
            {
                Response.Write("<script>alert('请输入完整信息')</script>");
                return;
            }
            else
            {
                if (IsValidInt(txtKM.Text.Trim()) == false)
                {
                    Response.Write("<script>alert('请输入整数！')</script>");
                    return;
                }
                else
                {
                    mcObj.UpdateArea(Convert.ToInt32(this.Request["AreaID"].ToString()), txtName.Text.Trim(), Convert.ToInt32(txtKM.Text.Trim()));
                    Response.Write("<script>alert('修改成功！')</script>");
                    return;
                }
            }

        }
    }
    public bool IsValidInt(string num)
    {
        return Regex.IsMatch(num, @"[0-9]*$");

    }
  
}

答案：ShipArea.aspx：
public partial class Manger_ShipArea : System.Web.UI.Page
{
    MangerClass mcObj = new MangerClass();
    protected void Page_Load(object sender, EventArgs e)
    {
      //判断AID是否为空 ,如果为空则跳转到Fail.aspx页面
      if (Convert.ToString(Session["AID"]) == "")
        {
            Response.Redirect("Fail.aspx");
        }
        if (!IsPostBack)
        {
          //如果前一页面所传值为Manage，lblAction显示文本"配送地点管理",然后调用
           // gvAreaBind（）方法
          if (this.Request.QueryString["Action"] == "Manage")
            {
                lblAction.Text = "配送地点管理";
                gvAreaBind();
            }
            //如果所传值为Add ，lblAction显示文本"添加配送地点信息"
            else if (this.Request.QueryString["Action"] == "Add")
            {
                lblAction.Text = "添加配送地点信息";
              
            }
            //如果所传值为Modify，lblAction显示文本"修改配送地点信息"，调用
                //GetAreaInfo()方法
            else if (this.Request.QueryString["Action"] == "Modify")
            {
                lblAction.Text = "修改配送地点信息";
                GetAreaInfo();
            }

        }
    }
      //为gvArea绑定数据   
    public void gvAreaBind()
    { 
        DataSet ds = mcObj.ReturnAreaDs("AreaInfo");
        gvArea.DataSource = ds.Tables["AreaInfo"].DefaultView;
        gvArea.DataBind();
    }
     （//应该是分页的吧，不确定）
    protected void gvArea_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvArea.PageIndex = e.NewPageIndex;
        gvAreaBind();
    }
    //单击gvarea的删除栏进行的删除操作 并刷新gvarea
    protected void gvArea_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int P_Int_AreaID = Convert.ToInt32(gvArea.DataKeys[e.RowIndex].Value.ToString());
        mcObj.DeleteAreaInfo(P_Int_AreaID);
        gvAreaBind();
    }
    public void GetAreaInfo()
    {
        DataSet ds = mcObj.ReturnAreaDsByID(Convert.ToInt32(this.Request["AreaID"].ToString()), "AreaInfo");
        txtName.Text = ds.Tables["AreaInfo"].Rows[0][1].ToString();  //将第一行第一列的数据在txtName中输出
        txtKM.Text = ds.Tables["AreaInfo"].Rows[0][2].ToString();    //将第一行第2列的数据在txtKM中输出
    }
     //保存按钮的单击事件 
    protected void btnSave_Click(object sender, EventArgs e)
    {
         //根据之前选择的Action进行操作   
         if (this.Request.QueryString["Action"] == "Add")
        {
            //如果是Add 则判断 txtname 和txtKM是否都已经填写
           //如果有至少一项为空，则弹出提示框"请输入完整信息" 
           if (txtName.Text == ""||txtKM.Text =="")
            {
                Response.Write("<script>alert('请输入完整信息')</script>");
                return;
            }
            else
            {
               //如果都已经填写  则调用IsValidIn(string num) 判断txtKM中输入的数字是否是整数
               //如果不是整数则弹出消息框提示输入整数.反之则调用mcObj类中的InsertAre()方法
              //进行添加操作
                if (IsValidInt(txtKM.Text.Trim()) == false)
                {
                    Response.Write("<script>alert('请输入整数！')</script>");
                    return;
                }
                else
                { 
                 mcObj.InsertArea(txtName.Text.Trim(),Convert.ToInt32(txtKM.Text.Trim()));
                 Response.Write("<script>alert('插入成功！')</script>");
                 return;
                }
               
            }
     &n

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