title: No value given for one or more required parameters dr=ExecuteReader()
body: <pre><code>private void PopuniListu(){
      listBox1.Items.Clear();
  
      conn = new OleDbConnection(connString);
      conn.Open();
  
      cmd.Connection = conn;
      cmd.CommandType = CommandType.Text;
      cmd.CommandText = "SELECT Imeiprezimeautora FROM Tabela1";
  
      dr = cmd.ExecuteReader();
  
      while (dr.Read())
      {
          listBox1.Items.Add(dr.GetValue(0));
      }
  
      dr.Close();
      conn.Close();
   }
  </code></pre>
  
  <p>Here is error: </p>
  
  <blockquote>
    <p>No value given for one or more required parameters.</p>
    
    <p>dr = cmd.ExecuteReader()</p>
  </blockquote>