Object reference not set to an instance of an object (int)

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This error keeps popping up and I can't seem to figure out where it's coming from. Any jelp is appreciated. Thanks

if (!IsPostBack)
{
    DataTable LocalCart = new DataTable();
    LocalCart = (DataTable)Session["cart"];
    int LocalCartItemCount = (int) Session["CartItemCount"];
    Decimal LocalCartAmount = (Decimal)Session["CartAmount"];

    if (LocalCart.Rows.Count == 0)
    {
        titleLabel.Text = "Your shopping cart is empty!";
        GridCart.Visible = false;
        updateButton.Enabled = false;
        checkoutButton.Enabled = false;
        totalAmountLabel.Text = String.Format("{0:c}", 0);
    }
    else
    {
        GridCart.DataSource = LocalCart;
        GridCart.DataBind();
        titleLabel.Text = "These are the products in your shopping cart:";
        GridCart.Visible = true;
        updateButton.Enabled = true;
        checkoutButton.Enabled = true;
        totalAmountLabel.Text = String.Format("{0:c}", LocalCartAmount);
    }

It's saying the error is here ->

int LocalCartItemCount = (int) Session["CartItemCount"];

Posted 18-Apr-13 6:48am

Arshad Jugon

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Comments

Sergey Alexandrovich Kryukov 18-Apr-13 15:38pm

This is exception. Not error, exception. Always provide comprehensive exception information.
—SA

2 solutions

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Dave Kreskowiak · Accepted Answer · 2013-04-18T07:01:00

Solution 1

Well, it's easy really. The statement Session["CartItemCount"] is returning null. This is probably because there is no value assigned to the "CartItemCount" in the Session variable or "CartItemCount" doesn't exist at all.

Posted 18-Apr-13 7:01am

Dave Kreskowiak

Comments

Sergey Alexandrovich Kryukov 18-Apr-13 15:41pm

Sure, a 5.
—SA

fjdiewornncalwe 18-Apr-13 16:15pm

+5.

José Amílcar Casimiro · Accepted Answer · 2013-04-18T07:03:00

Solution 2

Hi,

Most probably Session["CartItemCount"] does not have a value inside.

Change the following line please:

int LocalCartItemCount = (int) Session["CartItemCount"];

for

int LocalCartItemCount = Session["CartItemCount"]==null ? 0 : Convert.ToInt32(Session["CartItemCount"]);

good luck,
jafc

Posted 18-Apr-13 7:03am

José Amílcar Casimiro

Comments

Arshad Jugon 18-Apr-13 13:13pm

I tried it works, but the same error popped up at another place.

here -> if (LocalCart.Rows.Count == 0) [Same Error]

my updated code

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

DataTable LocalCart = new DataTable();
LocalCart = (DataTable)Session["cart"];
int LocalCartItemCount = Session["CartItemCount"] == null ? 0 : Convert.ToInt32(Session["CartItemCount"]);
Decimal LocalCartAmount = Session["CartAmount"] == null ? 0 : Convert.ToDecimal(Session["CartAmount"]);

if (LocalCart.Rows.Count == 0)
{
titleLabel.Text = "Your shopping cart is empty!";
GridCart.Visible = false;
updateButton.Enabled = false;
checkoutButton.Enabled = false;
totalAmountLabel.Text = String.Format("{0:c}", 0);
}
else
{
GridCart.DataSource = LocalCart;
GridCart.DataBind();
titleLabel.Text = "These are the products in your shopping cart:";
GridCart.Visible = true;
updateButton.Enabled = true;
checkoutButton.Enabled = true;
totalAmountLabel.Text = String.Format("{0:c}", LocalCartAmount);
}
}
}

Sergey Alexandrovich Kryukov 18-Apr-13 15:40pm

Look, are you going to ask the same question again and again every time you face with the exception? Instead of trying to understand the answer you got?
—SA

José Amílcar Casimiro 18-Apr-13 14:53pm

Your problem begins in this line: "LocalCart = (DataTable)Session["cart"];"
Do some work now please.

Sergey Alexandrovich Kryukov 18-Apr-13 15:41pm

Agree, OP needs to do some brain work. My 5 for the answer, by the way.
—SA

José Amílcar Casimiro 18-Apr-13 16:24pm

Agree. Thx.