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Asked: 2026-05-11T11:21:51+00:00

I have a strange problem. I am trying to update some fields using linq

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I have a strange problem. I am trying to update some fields using linq and it is not working. I tried to build the site and debug it which works and shows that the function is called. I also tried manually adding the values in the code behind file and that works too but somehow on runtime the form doesnt pass the values back from the text fields.

<%@ Page Language='C#' AutoEventWireup='true' CodeFile='AddEditBook1.aspx.cs' MasterPageFile='../AdminMaster.master' Inherits='AdminPanel_AddEditBook1' Title='Add or Edit Book Page'%>  <asp:Content ID='Content1' ContentPlaceHolderID='ContentPagePlaceHolder1' Runat='Server'> <div class='content'>      <div class='titleMain'>Library -> Add or Edit Book Page     </div>     <h1><span></span>Add or Edit Book Page</h1>      <div class='contentpage' >         <p>On this page you can Add or Edit Book Page</p>          <asp:Label ID='AddEditBookMsg' runat='server' Visible='false' />              <table width='650'  class='table' cellspacing='15'>                 <tr>                     <td>Book ID</td>                     <td><asp:Label ID='BookId' runat='server' /></td>                 </tr>                 <tr>                     <td>Book name</td>                     <td><asp:TextBox ID='BookName' runat='server' /></td>                 </tr>                 <tr>                     <td>Author</td>                     <td><asp:TextBox ID='BookAuthor' runat='server' Text='' /></td>                 </tr>

Code:

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq;  public partial class AdminPanel_AddEditBook1 : System.Web.UI.Page {     // book represents 3 tables     protected void Page_Load(object sender, EventArgs e)     {         AddEditBookMsg.Visible = false;         if (Request['book_id'] != null)         {             GetExistingBook();         }     }      public void GetExistingBook()     {         BooksDataContext book = new BooksDataContext();         int book_id = Int32.Parse(Request['book_id'].ToString());         var bookexist = book.books.Single(b => b.book_id == book_id);         var bookDDL = from c in book.categories                       select c;         var bookexistdesc = book.bookdescs.Single(bds => bds.book_id == book_id);         if (bookexist.book_id == book_id)         {             BookName.Text = bookexist.book_name;             BookAuthor.Text = bookexist.book_author;             BookShortDesc.Text = bookexist.book_short_desc;             BookLongDesc.Text = bookexistdesc.book_long_desc;             BookImg.Text = bookexist.book_img;             BookSqu.Text = bookexist.book_squ;             BookArrived.Text = bookexist.book_arrived.ToString();             BookQty.Text = bookexist.book_qty.ToString();              if (!Page.IsPostBack)             {                 CaID.DataSource = bookDDL;                 CaID.DataTextField = 'ca_name';                 CaID.DataValueField = 'ca_id';                 CaID.DataBind();             }         }     }      protected void update_Click(object sender, EventArgs e)     {         BooksDataContext book = new BooksDataContext();          int book_id = Int32.Parse(Request['book_id'].ToString());         book bookexist2 = book.books.Single(b1 => b1.book_id == book_id);         bookdesc bookexistdesc2 = book.bookdescs.Single(bds1 => bds1.book_id == book_id);           bookexist2.book_name = BookName.Text;         bookexist2.book_author = BookAuthor.Text.ToString();         bookexist2.book_short_desc = BookShortDesc.Text;          bookexist2.book_img = BookImg.Text;         bookexist2.book_squ = BookSqu.Text;         bookexist2.book_arrived = DateTime.Parse(BookArrived.Text);         bookexist2.book_qty = Int32.Parse(BookQty.Text);          bookexistdesc2.book_long_desc = BookLongDesc.Text;         book.SubmitChanges();     } }
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1 Answer

  1. You forgot to check if it is a postback in Page_Load. You’ll reload from the db on postback too…

    if (!IsPostback()) {   if (Request['book_id'] != null)   {     GetExistingBook();   } }
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