In order to find out all of the columns that have been changed in a DataSet, you need to resort to code similar to the following. I sure liked the way MIDAS/DataSnap handled this better. A simple call to NewValue, and off you go. Another thing to keep in mind, DataRowVersion.Proposed is only valid between BeginEdit()/EndEdit() calls, so you are forced to write code like this instead:

      if (!dataSet1.HasChanges())
        return;

      DataSet ds = dataSet1.GetChanges();
      foreach (DataTable tbl in ds.Tables)
      {
        foreach (DataRow dr in tbl.Rows)
        {
          for (int i=0; i < tbl.Columns.Count; i++)
          {
            if (dr[i, DataRowVersion.Current] != null && !dr[i, DataRowVersion.Current].Equals(dr[i, DataRowVersion.Original]))
              textBox1.AppendText(tbl.TableName + "." + tbl.Columns[i].ColumnName + " changed (" + dr[i, DataRowVersion.Original] + " -> " + dr[i, DataRowVersion.Current] + ")" + Environment.NewLine);
          }
        }
      }