title: c# DataGridViewComboBoxColumn selectedValue spread throughout the whole line
body: <p>I'm stuck with the following problem:</p>
  
  <p>i build a dataGridView with 7 DataGridViewComboBoxColumn, adding with the following code</p>
  
  <pre class="lang-cs prettyprint-override"><code>foreach (string jour in Enum.GetNames(typeof(Jours)))
          {
              DataGridViewComboBoxColumn comboboxColumn = CreateComboBoxColumn();
              List&lt;Journee&gt; myJourneeList = new List&lt;Journee&gt;(mydatas.journeeTypeList.ToList());
              comboboxColumn.DataSource = myJourneeList;
              comboboxColumn.DisplayMember = "name";
              comboboxColumn.ValueMember = "id";
              comboboxColumn.DataPropertyName = "id";
              comboboxColumn.HeaderText = jour;
              dataGridView_machineSemaines.Columns.Add(comboboxColumn);
              setSelectedValue(jour, myJourneeList);
          }
  </code></pre>
  
  <p>I get the following dataGridView :</p>
  
  <p><a href="https://i.stack.imgur.com/rZSbo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rZSbo.png" alt="enter image description here"></a></p>
  
  <p>then if i selected a new value in one combobox :</p>
  
  <p><a href="https://i.stack.imgur.com/Qceo7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Qceo7.png" alt="enter image description here"></a></p>
  
  <p>and if a i scroll (with the horizontal-scroll) (or if i open an other tab and come back to this tab), then the whole row get the same selectedValue :</p>
  
  <p><a href="https://i.stack.imgur.com/wJbcc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wJbcc.png" alt="enter image description here"></a></p>
  
  <p>how can i fix this problem?</p>