Object reference not set to an instance of an object. plz solve this

Question

3.00/5 (1 vote)

See more:

public class ImageHandler : IHttpHandler {
    string strcon = ConfigurationManager.AppSettings["ConnectionString"].ToString();
    
    public void ProcessRequest (HttpContext context) 
    {
        context.Response.ContentType = "text/plain";
        context.Response.Write("Hello World");
        string imageid = context.Request.QueryString["ImID"];
        SqlConnection connection = new SqlConnection("Data Source=CIODEV03\\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=True");
        connection.Open();
        SqlCommand command = new SqlCommand("select Image from Image1 where ImageId=" + imageid, connection);
        SqlDataReader dr = command.ExecuteReader();
        dr.Read();
        context.Response.BinaryWrite((Byte[])dr[0]);
        connection.Close();
        context.Response.End();
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }
}

error..........

Object reference not set to an instance of an object.
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 7:  
Line 8:  public class ImageHandler : IHttpHandler {
Line 9:      string strcon = ConfigurationManager.AppSettings["ConnectionString"].ToString();
Line 10:     
Line 11:     public void ProcessRequest (HttpContext context)

Posted 16-Feb-12 19:09pm

rockpune

Updated 16-Feb-12 19:11pm

Varun Sareen

v2

Add a Solution

Comments

Varun Sareen 17-Feb-12 1:12am

edit for : added pre tag

rockpune 17-Feb-12 1:19am

am newly learnig .net sir plz tell me how to add pre tag

Varun Sareen 17-Feb-12 1:33am

Dear Friend, Where ever you start your code then start with <pre> and when ends the code then end it with </pre>

Sanjay K. Gupta 17-Feb-12 2:17am

Rock..
see web.confing->appSettings key

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Varun Sareen · Answer 1 · 2012-02-16T19:37:00

Dear Friend,

An object reference not set to an instance of an object comes whenever you are using or assigning a variable to something which is not yet initialized and what i get from your line of code error is that your connection string

ConfigurationManager.AppSettings["ConnectionString"].ToString();

is blank as you may not have initialized it in the webconfig file.

So try to check there you may get the solution there.

If it helps you out then mark this as your answer and i am open to queries.

Thanks