how to get rows and cells of datagrid in wpf

var rows = GetDataGridRows(datagrid1);

foreach (DataGridRow r in rows)
{
 //   DataRowView rv = (DataRowView)r.Item;
  foreach (DataGridColumn column in datagrid1.Columns)
  {
      if (column.GetCellContent(r) is TextBlock)
      {
           TextBlock cellContent = column.GetCellContent(r) as TextBlock;
           MessageBox.Show(cellContent.Text);
      }
  }
}

 public IEnumerable<datagridrow> GetDataGridRows(DataGrid grid)
     {
        var itemsSource = grid.ItemsSource as IEnumerable;
        if (null == itemsSource) yield return null;
        foreach (var item in itemsSource)
        {
          var row = grid.ItemContainerGenerator.ContainerFromItem(item) as DataGridRow;
                    if (null != row) yield return row;
        }
     }
  
</datagridrow>