title: database not affected by dataset after renewing a table
body: <p>I have a dataset that contains a table. This table has just a column (without primary key). My table is shown in a datagridview. Now, I want to edit data of table. So, I store data of table in a DataTable and then, I clear all data of table in dataset and fill it by DataTable, like this:</p>
  
  <pre><code>DataView dv = ((BindingSource)tblMyTableDataGridView.DataSource).SyncRoot as DataView;
  DataTable dt = dv.ToTable();
  IDataReader dr = dt.CreateDataReader();
  myDataSet.tblMyTable.Clear();
  myDataSet.tblMyTable.Load(dr);
  </code></pre>
  
  <p>By breaking point, that specified that tblMyTable has changed truely.
  <strong><em>But it not affected on database</em></strong>. My code is:</p>
  
  <pre><code>tableAdapterManager.tblMyTableTableAdapter.Update(myDataSet.tblMyTable);
  tableAdapterManager.UpdateAll(myDataSet);
  </code></pre>
  
  <p>What is wrong?!?!?
  Thanks.</p>