title: Column added to .net DataTable does not get added to database Table
body: <p>I'm new to this site and I started some time ago to program an application.
  Right now I'm stuck at a problem and I have no idea how to solve it.</p>
  
  <p>My problem is: I want to register every user in a new column, because I have to save a great amount of data for each of them (up to 1000 rows). Now I add a new column to the already existing table. But the thing is, if I want to retrieve this data I get an error that says there is no column called like this.</p>
  
  <pre><code>programDataSet.User.Columns.Add(textBoxUser.Text, typeof(Int32));
  
  for (int i = 0; i &lt; 4 &amp;&amp; i &lt; alchemieDataSet.User.Count; i++)
  {
       programDataSet.User[i][textBoxUser.Text] = "1";
  }
  
  for (int i = 0; i &lt; programDataSet.User.Count; i++)
  {
       alchemieDataSet.User[i][textBoxUser.Text] = "0";
  }
  
  this.Validate();
  this.userBindingSource.EndEdit();
  this.tableAdapterManager.UpdateAll(this.programDataSet);
  MessageBox.Show("Registration completed");
  </code></pre>
  
  <p>Does anyone have an idea what I made wrong?</p>