asp.net mobile 2.0

i am trying to send the value id inorder to connect 2 pages. the search page with the comments page.

this is the error i get Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code

Exception Details:System.NullReferenceException :Object reference not set to an instance of an object

Source Error:

Line 101:
Line 102:        ListComment.DataSource = comm;
Line 103:        ListComment.DataBind();
Line 104:
Line 105:    }

here is my code for the comments page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Comment.aspx.cs" Inherits="Comment"  Debug="true"%>
<%@ Register TagPrefix="mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile"%>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:Form id="Form1" runat="server" BackColor="#fcf9f3" Paginate="True">

        <mobile:Label ID="CommentError" Runat="server" ForeColor="red" 
            Font-Size="Small" Font-Bold="True" Visible="false" />

        <mobile:Label ID="Label2" Runat="server" ForeColor="#d3af63" Font-Italic="True" 
            Font-Name="Monotype Covasia" Font-Bold="True" text="Write Comments" />
        <mobile:Label ID="lblCommentTitle" Runat="server" text="Title" />
        <mobile:TextBox ID="txtCommentTitle" Runat="server" text="" />
        <br />

        <mobile:Label ID="lblCommentText" Runat="server" text="Comment" />
        <mobile:TextBox ID="txtCommentText" Runat="server" text=""/>

        <br />
        <mobile:Command ID="submit" Runat="server" text="Submit" OnClick="submitform_Click" />
        <br />

        <mobile:Label ID="Label1" Runat="server" ForeColor="#d3af63" Font-Italic="True" 
            Font-Name="Monotype Covasia" Font-Bold="True" text="Read Comments"/>
        <mobile:list runat="server" id="ListComment" DataTextfield="comment_text"
             DataValueField="comment_text" Font-Size="Small" Font-Italic="True" 
             ItemsPerPage="5" Wrapping="Wrap"  BreakAfter="True"/>

    </mobile:Form>
</body>
</html>


using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.Mobile;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.MobileControls;
using System.Data.Linq;
using System.Xml.Linq;
using System.Linq;

public partial class Comment : System.Web.UI.MobileControls.MobilePage
{
    CommentDataContext Comments = new CommentDataContext();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["error_msg"] != null)
        {
            CommentError.Text = Session["error_msg"].ToString();
            Session["error_msg"] = null;
            CommentError.Visible = true;
        }

        if (Session["r_id"] != null)
        {
            String r_id = Session["r_id"].ToString();

        }       

        GetComment();
    }

    protected void submitform_Click(object sender, EventArgs e)
    {
        if (Page.IsValid) 
        {
            AddComment();
        }
    }


    #region Inserting a comment
    protected void AddComment()
    {
        mobile_comment mobilecon = new mobile_comment();
        mobilecon.comment_text = txtCommentText.Text;
        mobilecon.comment_title = txtCommentTitle.Text;

        Comments.mobile_comments.InsertOnSubmit(mobilecon);
        Comments.SubmitChanges();

        Session["error_msg"] = "Your comment has been added";
        Response.Redirect("Comment.aspx");
    }
    #endregion


    protected void GetComment()
    {
        var comm = from c in Comments.mobile_comments
                   where c.r_id == Int32.Parse(Session["r_id"].ToString())
                   //where c.r_id == Int32.Parse(Request["r_id"].ToString())
                   select c;

        ListComment.DataSource = comm;
        ListComment.DataBind();

    }
}

am i using this statement correctly where c.r_id == Int32.Parse(Session["r_id"].ToString())

if not then how do i link d ids?

ansaurus

tags:

views:

answers:

asp.net mobile 2.0

related questions