Can't get data from database "No data exists for the row/column"

Question

0.00/5 (No votes)

See more:

Hi here is the code I wrote. there is no error at my connection and my database is filled with data which I want to take but I cant get "Urunler.isim" datas I always get "No data exists for the row/column" error message at my sSQL2 code thanks already for your help :) .

class urunadapter
   {
       public void urungetir(string firma , ComboBox cmburun)
       {
           companymodel.cnvt conn = new companymodel.cnvt();
           conn.baglan();
           DataSet dt = new DataSet();

           string sSQL = "SELECT * FROM Firmalar WHERE Firmalar.isim='" + firma + "'";
           OleDbCommand komut = new OleDbCommand(sSQL,conn.baglanti);
           OleDbDataReader oku = komut.ExecuteReader();


           string sSQL2 = "SELECT Urunler.isim FROM Urunler WHERE Firmalar.FirmaID="+oku["FirmaID"]+"";
           komut = new OleDbCommand(sSQL2,conn.baglanti);
           OleDbDataAdapter adp = new OleDbDataAdapter(komut);
           adp.Fill(dt, "Urunler");
           cmburun.Items.Add("Seçiniz");
           cmburun.SelectedIndex = 0;
           foreach (DataRow listele in dt.Tables["Urunler"].Rows)
           {
               string satir = listele[0].ToString();
               bool durum = cmburun.Items.Contains(satir);
               if(!durum)
               {
                   cmburun.Items.Add(satir).ToString();
               }
           }
           conn.bkes();

Posted 31-Dec-10 20:20pm

Beytul

Add a Solution

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)

AnupKumarYadav · Accepted Answer · 2010-12-31T21:58:00

Since you are using DataReader , The default position of the OledbDataReader is before the first record. Therefore, you must call Read to begin accessing any data.
You should Call

C#

//Call Read method on oku before accessing data.
OleDbDataReader oku = komut.ExecuteReader();
while (oku.Read()) 
{
 // Access record of oku in loop , if you are suppoosed to get zero or more than one record

}

oku.Read() will return false in case no record exists, so you should always evaluate oku.Read() before accessing any data either using If or While or whatever you like.