title: how I can have the following value using Linq
body: <p>I have a problem to retrieve the following value for the time I retrieve the first value in the database using this code</p>
  
  <pre><code>revision_csharpContainer premier = new revision_csharpContainer();
  etudiant et = premier.etudiants.First();
  comboBox1.Text = et.id_etudiant.ToString();
  textBox1.Text = et.Nom;
  textBox2.Text = et.prenom;
  textBox3.Text = et.age.ToString();
  comboBox2.Text = et.filiere.filiere1;
  textBox4.Text = et.photo;
  </code></pre>
  
  <p>but I want when I click the following button I get the next value from the database </p>