使用 C# 在 aspnet 中使用会话在 SQL Server 数据库中插入记录

Question

I'm trying to insert a record into a SQL Server 2014 database using ASP.NET with C#.

I have implemented a session for my gridview data, and I'm trying to insert that session into the database, but when I click the button "book", only the top URL changes:

Database:

The record isn't getting inserted into the database nor my Label (Errorm) is changing to gg.

.aspx file:

<%@ Page Title=""
    Language="C#"
    MasterPageFile="~/Main.Master"
    AutoEventWireup="true"
    CodeBehind="hotels.aspx.cs"
    Inherits="Hotel_Mangement.hotels" %>

<asp:Content ID="Content1" ContentPlaceHolderID="hotels" runat="server">
    <div class="destinations">
        <div class="destination-head">
            <div class="wrap">
                <h3>Hotels</h3>
            </div>

            <!-- End-destinations -->
            <div class="find-place dfind-place">
                <div class="wrap">
                    <div class="p-h">
                        <span>FIND YOUR</span>
                        <label>HOTEL</label>
                    </div>

                    <!-- strat-date-picker -->
                    <script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
                    <script>
                        $(function () {
                            $("#<%= txtstart.ClientID %>").datepicker();
                        });
                    </script>
                    <!-- /End-date-picker -->

                    <!-- strat-date-picker -->
                    <script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
                    <script>
                        $(function () {
                            $("#<%= txtend.ClientID %>").datepicker();
                        });
                    </script>
                    <!---/End-date-piker---->

                    <div class="p-ww">
                        <form>
                            <span> City or Area</span>
                            <asp:DropDownList ID="dl1" runat="server" class="dest" required="This field cannot be blank">
                                <asp:ListItem Selected="True">Location</asp:ListItem>

                                <asp:ListItem>Mumbai</asp:ListItem>
                                <asp:ListItem>Goa</asp:ListItem>
                                <asp:ListItem>Delhi</asp:ListItem>
                                <asp:ListItem>Ahmedabad</asp:ListItem>
                                <asp:ListItem>Jammu</asp:ListItem>
                                <asp:ListItem>Jharkhand</asp:ListItem>
                                <asp:ListItem>Kerala</asp:ListItem>
                                <asp:ListItem>Bhuj</asp:ListItem>
                                <asp:ListItem>Bengaluru</asp:ListItem>
                                <asp:ListItem>Kalyan</asp:ListItem>
                            </asp:DropDownList><br />

                            <br /><span> Check-in</span>
                            <asp:TextBox ID="txtstart" runat="server" class="date" required="This field cannot be blank"></asp:TextBox>

                            <span> Check-out</span>
                            <asp:TextBox ID="txtend" runat="server"  class="date" required="This field cannot be blank"></asp:TextBox><br /> <br />
                            <span> Number of rooms</span>
                            <asp:DropDownList ID="dlrooms" runat="server" required="This field cannot be blank">
                                <asp:ListItem Selected="True">Select number of rooms</asp:ListItem>
                                <asp:ListItem>1</asp:ListItem>
                                <asp:ListItem>2</asp:ListItem>
                                <asp:ListItem>3</asp:ListItem>
                                <asp:ListItem>4</asp:ListItem>
                            </asp:DropDownList><br /><br />

                            <span> Number of members</span>
                            <asp:DropDownList ID="dlmumbers" runat="server" required="This field cannot be blank">
                                <asp:ListItem Selected="True">Select number of members per room</asp:ListItem>
                                <asp:ListItem>1</asp:ListItem>
                                <asp:ListItem>2</asp:ListItem>
                                <asp:ListItem>3</asp:ListItem>
                                <asp:ListItem>4</asp:ListItem>
                                <asp:ListItem>5</asp:ListItem>
                                <asp:ListItem>6</asp:ListItem>
                            </asp:DropDownList>
                            <br /> <br />

                            <asp:Button ID="Button1" runat="server" Text="Search" OnClick="Button1_Click" />

                        </form>
                    </div>
                    <div class="clear"> </div>
                </div>
            </div>
            <!----//End-find-place---->

        </div>
        <div class="criuse-main">
            <div class="wrap">
                <div class="criuse-head1">
                    <h3>CHEAPEST HOTELS</h3>
                </div>
            </div>
        </div>

        <asp:SqlDataSource ID="SqlDataSource1"
                           runat="server"
                           ConnectionString='<%$ ConnectionStrings:RegisterConnectionString15 %>'
                           SelectCommand="SELECT * FROM [hotels_main]"></asp:SqlDataSource>

        <asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1" >

            <ItemTemplate>
                <div ID="div1" runat="server">
                    <div class="criuse-main" >
                        <div class="wrap">
                            <div class="criuse-grids">
                                <div class="criuse-grid">
                                    <div class="criuse-grid-head">
                                        <div class="criuse-img">
                                            <div class="criuse-pic">
                                                 <asp:Image ID="Image1" runat="server" ImageUrl='<%#Eval("ImagePath") %>'  Height="350px"  width="1000px"/>
                                            </div>
                                            <div class="criuse-pic-info">
                                                <div class="criuse-pic-info-top">
                                                    <div class="criuse-pic-info-top-weather">
                                                        <p>33<label>o</label><i>c</i><span> </span></p>
                                                    </div>
                                                    <div class="criuse-pic-info-top-place-name">
                                                        <h2><span><%#Eval("hotel_location") %></span></h2>
                                                    </div>
                                                </div>
                                                <div class="criuse-pic-info-price">
                                                    <p><span>Starting From</span> <h4><%#Eval("price") %> $</h4></p>
                                                </div>
                                            </div>
                                        </div>
                                        <div class="criuse-info">
                                            <div class="criuse-info-left">
                                                <ul>
                                                    <li><a class="c-hotel" href="#"><span> </span><%#Eval("rooms_available") %></a></li>
                                                    <li><a class="c-air" href="flight.aspx"><span> </span> Air Ticket</a></li>
                                                    <li><a class="c-fast" href="#"><span> </span> Guest per room:<%#Eval("max_guest") %></a></li>
                                                    <li><a class="c-car" href="#"><span> </span> Car for All transfers</a></li>
                                                    <div class="clear"> </div>
                                                </ul>
                                            </div>
                                            <div class="clear"> </div>
                                        </div>
                                    </div>
                                    <div class="criuse-grid-info">
                                        <h1>    <a href="hotels_main.aspx?id=<%#Eval("hotel_id") %>" ><%#Eval("hotel_name") %></a></h1>

                                        <p><%#Eval("s_desc") %> </p>

                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </ItemTemplate>
        </asp:Repeater>

        <center>
            <div>
                <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" class="myGridClass" AutoGenerateColumns="False">
                    <AlternatingRowStyle BackColor="White" />
                    <EditRowStyle BackColor="#7C6F57" />
                    <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
                    <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
                    <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
                    <RowStyle BackColor="#E3EAEB" />
                    <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
                    <SortedAscendingCellStyle BackColor="#F8FAFA" />
                    <SortedAscendingHeaderStyle BackColor="#246B61" />
                    <SortedDescendingCellStyle BackColor="#D4DFE1" />
                    <SortedDescendingHeaderStyle BackColor="#15524A" />

                    <Columns>
                        <asp:TemplateField HeaderText="HotelName">
                            <ItemTemplate>
                                <asp:Label ID="lblhotelname" runat="server" Text='<%# Bind("hotel_name") %>' ></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>

                        <asp:TemplateField HeaderText="HotelLocation">
                            <ItemTemplate>
                                <asp:Label ID="lblhotellocation" runat="server" Text='<%# Bind("hotel_location") %>' ></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>

                        <asp:TemplateField HeaderText="Price">
                            <ItemTemplate>
                                <asp:Label ID="lblprice" runat="server" Text='<%# Bind("price") %>' ></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>

                    </Columns>
                </asp:GridView>

                <asp:Label ID="Label1" runat="server" Text="Label" Visible="False"></asp:Label>
                <br />

                <form>
                    <asp:Button ID="book" runat="server" Text="Book now" class="d-next" OnClick="book_Click" />
                </form>

                <asp:Label ID="lprice" runat="server" Text="Label" Visible="False"></asp:Label>
                <asp:Label ID="lcheckin" runat="server" Text="Label" Visible="False"></asp:Label>
                <asp:Label ID="lcheckout" runat="server" Text="Label" Visible="False"></asp:Label>
                <asp:Label ID="lmembers" runat="server" Text="Label" Visible="False"></asp:Label>
                <asp:Label ID="lrooms" runat="server" Text="Label" Visible="False"></asp:Label>

                <br />
                <asp:Label ID="Errorm" runat="server" Text="Label"></asp:Label>
            </div>
        </center>

    </div>
</asp:Content>

.aspx.cs code-behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

namespace Hotel_Mangement
{
    public partial class hotels : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(@"Data Source=RISHIK\SQLEXPRESS;Initial Catalog=Register;Integrated Security=True");

        protected void Page_Load(object sender, EventArgs e)
        {
            GridView1.Visible = false;
            /* div1.Visible = true; */
            con.Open();
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "select * from hotels_main";
            cmd.ExecuteNonQuery();
            DataTable dt = new DataTable();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);

            con.Close();
            book.Visible = false;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string query =
                "select hotel_name, hotel_location ,price from hotels_main where hotel_location='" +
                dl1.Text + "' ";
            SqlDataAdapter da = new SqlDataAdapter(query, con);

            DataSet ds = new DataSet();
            da.Fill(ds);

            GridView1.DataSource = ds;
            GridView1.DataBind();
            GridView1.Visible=true;

            con.Close();

            if (ds.Tables[0].Rows.Count == 0)
            {
                Label1.Visible = true;
                Label1.Text = "No data found";
                book.Visible = false;
            }
            else
            {
               /* div1.Visible = true;*/

                Label1.Visible = false;
                book.Visible = true;
                DataTable dt = new DataTable();
                DataRow dr;
                dt.Columns.Add(new System.Data.DataColumn("HotelName", typeof(String)));
                dt.Columns.Add(new System.Data.DataColumn("HotelLocation", typeof(String)));
                dt.Columns.Add(new System.Data.DataColumn("Price", typeof(String)));
                foreach (GridViewRow row in GridView1.Rows)
                {
                    Label lblhotelname = (Label)row.FindControl("lblhotelname");
                    Session["hotelname"] = lblhotelname.Text;
                    Label lblhotellocation = (Label)row.FindControl("lblhotellocation");
                    Session["hotelocation"] = lblhotellocation.Text;
                    Label lblprice = (Label)row.FindControl("lblprice");
                    Session["price"] = lblprice.Text;
                    dr = dt.NewRow();
                    dr[0] = lblhotelname.Text;
                    dr[1] = lblhotellocation.Text;
                    dr[2] = lblprice.Text;
                    dt.Rows.Add(dr);
                }
                Session["check_in"] = txtstart.Text.ToString();
                Session["check_out"] = txtend.Text.ToString();
            }
        }

        /*private void SendGridInfo()
        {
            }
            Session["GridData"] = dt; Response.Redirect("WebForm2.aspx");
        }  */

        protected void book_Click(object sender, EventArgs e)
        {
            con.Open();
            string insertQuery = "Insert into hotelbook_details values('" + Session["USER_ID"].ToString() + "','" + Session["hotelname"].ToString() + "','" + Session["hotelocation"].ToString() + "','" + Session["check_in"].ToString() + "','" + Session["check_out"].ToString() + "','" + Session["price"].ToString() + "')";

            SqlCommand cmd1 = new SqlCommand(insertQuery, con);
            cmd1.ExecuteNonQuery();
            con.Close();

            Errorm.Text = "gg";
        }
    }
}

Answer 1

The problem was the <form> ..... </form> tag in aspx. As I am using a master page I don't need it.

After removing all the form tags, it worked all fine.

Answer 2

Are you sure it is not saving? Have you checked your database?

Change your load page to:

if (IsPostBack == false){
     GridView1.Visible = false;
     /* div1.Visible = true; */
     con.Open();
     SqlCommand cmd = con.CreateCommand();
     cmd.CommandType = CommandType.Text;
     cmd.CommandText = "select * from hotels_main";
     cmd.ExecuteNonQuery();
     DataTable dt = new DataTable();
     SqlDataAdapter da = new SqlDataAdapter(cmd);
     da.Fill(dt);

     con.Close();
     book.Visible = false;
}

When you click a button it will reload the form load. The code above will prevent it from loading when doing a post-back, that is, clicking a button.