How do I save a column of a data from datagrid in WPF

var NumberList= new List<double>();

<pre lang="C#">foreach (var row in dataGridView1.row)
{
/// call the below method here with appropriate parameter
<pre lang="C#">NumberList.Add(Convert.ToDouble(value return from method));
}

&amp;lt;pre lang=&amp;quot;C#&amp;quot;&amp;gt;public string GetCellValue(DataGrid datagrid, int row, int column)
  {
      var cellInfo = new DataGridCellInfo(
          datagrid.Items[row], dataGrid.Columns[column]);

      DataGridCell cell = null;
      var cellContent = cellInfo.Column.GetCellContent(cellInfo.Item);
      if (cellContent != null)
          cell = (DataGridCell)cellContent.Parent;

      if (cell == null) return string.Empty;

      // if DataGridTextColumn / DataGridComboBoxColumn is used
      // or AutoGeneratedColumns is True
      if (cell.Content is TextBlock)
          return ((TextBlock)cell.Content).Text;
      else if (cell.Content is ComboBox)
          return ((ComboBox)cell.Content).Text;

      // if DataGridTemplateColumn is used
      // assuming cells are either TextBox, TextBlock or ComboBox. Other Types could be handled the same way.
      else
      {
          var txtPresenter = FindVisualChild&amp;amp;lt;TextBox&amp;amp;gt;((ContentPresenter)cell.Content);
          if (txtPresenter != null) return txtPresenter.Text;
          var txbPresenter = FindVisualChild&amp;amp;lt;TextBlock&amp;amp;gt;((ContentPresenter)cell.Content);
          if (txbPresenter != null) return txbPresenter.Text;
          var cmbPresenter = FindVisualChild&amp;amp;lt;ComboBox&amp;amp;gt;((ContentPresenter)cell.Content);
          if (cmbPresenter != null) return cmbPresenter.Text;
      }
      return string.Empty;
  }

  public static T FindVisualChild&amp;amp;lt;T&amp;amp;gt;(DependencyObject obj) where T : DependencyObject
  {
      for (int i = 0; i &amp;amp;lt; VisualTreeHelper.GetChildrenCount(obj); i++)
      {
          DependencyObject child = VisualTreeHelper.GetChild(obj, i);
          if (child != null &amp;amp;amp;&amp;amp;amp; child is T)
              return (T)child;
          else
          {
              T childOfChild = FindVisualChild&amp;amp;lt;T&amp;amp;gt;(child);
              if (childOfChild != null)
                  return childOfChild;
          }
      }
      return null;
  }&amp;lt;/pre&amp;gt;&lt;/pre&gt;</pre>