Object reference not set to an instance of an object.

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hello friends,

Please See this code, and suggest me where m i wrong....

C#

<%@ WebHandler Language="C#" Class="UploadCS" %>
using System;
using System.Web;
using System.IO;
using System.Web.SessionState;
using System.Collections.Generic;
public class UploadCS : IHttpHandler, IRequiresSessionState {
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Expires = -1;
        try
        {
            List<httppostedfile> files = (List<httppostedfile>)context.Session["Files"];
            HttpPostedFile postedFile = context.Request.Files["Filedata"];
            files.Add(postedFile);
            
            string filename = postedFile.FileName;
            context.Response.Write(filename);
            context.Response.StatusCode = 200;
        }
        catch (Exception ex)
        {
            context.Response.Write("Error: " + ex.Message);
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }
}

i use multi file uploader but i cant get list of posted file in files List
when i debug code i found one error when debuger reach this line "files.Add(postedFile);" Exception like
Object reference not set to an instance of an object.

Please help me to solve this issue

Posted 20-Nov-12 20:12pm

Shingala Anil

Updated 20-Nov-12 20:14pm

__TR__

v2

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Shmuel Zang · Answer 1 · 2012-11-20T20:30:00

Solution 1

It seems like the Files entry of your Session isn't initialized. Try to initialize it if it is null. Something like:

C#

List<httppostedfile> files = (List<httppostedfile>)context.Session["Files"];
if (files == null)
{
    files = new List<httppostedfile>();
    context.Session["Files"] = files;
}

Posted 20-Nov-12 20:30pm

Shmuel Zang

Comments

Shingala Anil 21-Nov-12 2:58am

Hello frnd,
thanks for you replay,
sorry your solution does not work for me...
still i count zero in files list

Shingala Anil 21-Nov-12 3:07am

I solve error but i cant get session value in code behind please help me for that