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Session Variable question for C#

Hello,

I am trying to use Session variables in an ASPX application. For some reason the code below doesn't seem to be assigning the Session variable as it is null when I try to access it on the other page. I have tried various code changes but nothing seems to work. The 'thisAssID' variable is not null and is used later on the page. So, I don't understand why the Session variable is not getting assigned properly.

Many thanks for any help! I am not that familiar with C#.

Cheers,

public void Page_Load(object sender, EventArgs e)
        {
            
			 
			  if (((Request.QueryString["ID"]) != "")) {
  thisAssID = int.Parse(Request.QueryString["ID"]);
 
  Session["TestID"] = thisAssID;

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mayank_joshi

are cookies enabled in your web browser?
by default asp.net creates a cookie on the browser of client computer to keep track of the session.

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Pratima

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dj_alik

Did you debug your code and if statement was executed
if (((Request.QueryString["ID"]) != ""))

cougarsy

ASKER

Hello and thank you for your response,

I added your code and the Response.Write executes correctly. However, when I use this code in the other ASPX page I get an error: System.NullReferenceException: Object reference not set to an instance of an object.

Code:

int thisID = (int)(Session["TestID"]);

Thanks again if you have any ideas.

cougarsy

ASKER

I would like to add that I changed my code to:

Session["TestID"] = Request.QueryString["ID"];

as pratima_mcs suggested and the Response.Write does execute correctly.

But, the problem now is I cannot seem to retrieve the Session variable. See the code above that throws the error.

Thanks again,

cougarsy

ASKER

One more thing--if I comment out the code above and assign the variable an integer, the code executes correctly:

// int thisID = (int)(Session["TestID"]);

int thisID=167;

So, I am not sure what I am doing wrong.

Many thanks,

SOLUTION

dj_alik

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SAMIR BHOGAYTA

Hello, You had already write querystring then why converted into int.parse

nidheeshmca

Check
EnableSessionState="False" This property in your page directive.

If it is set to False then set it True

cougarsy

ASKER

Hello and thank you for all of your comments. The solution was found through using "Convert.ToInt32" in combination with Session["TestID"] = Request.QueryString["ID"];,

So, I will split the points between the two.

Thank you again!

Cheers,