Checkboxlist selected property

hi guys
i want to use checkboxlist.selecteditem.selected property.

when i clicked the checkbox a int value must be written to db, when i clicked again the checkbox this value must be changed.

i wrote code like that but i have error -> Object reference not set to an instance of an object

what can i do? i m waiting your answers...

It usually occurs when your using a null reference. Make sure your object is being properly initialized.

i dont think i m using a null reference, cause when i clicked the random checkbox the element's informations come

my code is below

Code:

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if (cblNames.SelectedItem == null)
            {
                if (cblNames.SelectedItem.Selected==true)    //ERROR OMES HERE  (Object reference not set to an instance of an object)
                {
                    OleDbCommand com = new OleDbCommand("UPDATE kisi SET kisi_check=@p1 where kisi_id=@id", connect);
                    com.Parameters.AddWithValue("@id", cblNames.SelectedValue);
                    com.Parameters.AddWithValue("@p1", 1);
                    com.ExecuteNonQuery();
                }

                else if (cblNames.SelectedItem.Selected == false)
                {
                    OleDbCommand ucom = new OleDbCommand("UPDATE kisi SET kisi_check=@pc WHERE kisi_id=@i", connect);
                    ucom.Parameters.AddWithValue("@i", cblNames.SelectedValue);
                    ucom.Parameters.AddWithValue("@pc", 0);
                    ucom.ExecuteNonQuery();
                }
            }

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Quote:

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if (cblNames.SelectedItem == null)

---

isn't that a null reference ?
think about it,

Code:

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if (cblNames.SelectedItem == null)

---

then your code below will expand to this -

Code:

---

if(null.Selected == true)
{
...
}

---

ok thats right then i remove

Code:

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if (cblNames.SelectedItem == null)

---

but there is the same error on the same line

Quote:

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Originally Posted by Aga^^

ok thats right then i remove

Code:

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if (cblNames.SelectedItem == null)

---

but there is the same error on the same line

---

Yes, because if it was true before, that means you were passing in a null reference from somewhere. So, make sure all your objects are being initialized properly.

Try this -

Code:

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if (cblNames.SelectedItem != null)

---

so, that you know whats causing the trouble.

yess that works

thanks spidey

SelectedItem is null if nothing is selected in the listbox, thus your error.