help with NullReference exception in C#

Question

The following is a web method that is called from ajax, I have verified with firebug that the script is indeed passing two string values to my method:

public string DealerLogin_Click(string name, string pass)
{
    string g="adf";
    if (name == "w" && pass == "w")
    {
        HttpContext.Current.Session["public"] = "pub";
        g= "window.location = '/secure/Default.aspx'";
    }

    return g;
}

I'm passing "w" just for testing purposes. If I delete the if block then I don't get an error back from the server. I'm confused.

can you post the stack trace of the exception please - at present .Current or .Session are the only candidates — Andras Zoltan
– Andras Zoltan, Commented Jan 19, 2011 at 22:59
Can you verify if ASP.Net has assigned its session id at the time this web method is called? — TheGeekYouNeed
– TheGeekYouNeed, Commented Jan 19, 2011 at 23:07
The problem was either .Current or .Session. There was not previous sessions so I wrote the syntax wrong to create one. — The Muffin Man
– The Muffin Man, Commented Jan 19, 2011 at 23:14

Jeff Yates · Accepted Answer · 2011-01-19 23:02:07Z

5

Without seeing the stack trace, I would guess that HttpContext.Current or HttpContext.Current.Session is null.

answered Jan 19, 2011 at 23:02

Jeff Yates

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4 Comments

Jeff Yates Over a year ago

@SLaks (and Andras): Doh! I've been in CMMI training all day, my brain is fried. Thanks.

Andras Zoltan Over a year ago

@Jeff - s'okay, you're among friends

The Muffin Man Over a year ago

@Jeff Yates, You are correct. I don't know why I wrote that the way I did. Should be Session["public"]="pub";

Jeff Yates Over a year ago

@nick: Glad I was able to help.

The Muffin Man · Accepted Answer · 2011-01-19 23:22:56Z

1

Jeff is correct, but I wanted to add that using session within a web service requires that session be turned "on":

[WebMethod(EnableSession=true)]
public string DealerLogin_Click(string name, string pass)
{
    string g="";
    if (name == "w" && pass == "w")
    {
        Session["Public"]="pub";

        g= "window.location = '/secure/Default.aspx'";
    }

    return g;
}

answered Jan 19, 2011 at 23:22

The Muffin Man

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