C#

System.Drawing.Image _image = System.Drawing.Image.FromStream( new System.IO.MemoryStream( (byte[])myTable.Rows[ItemRowIndex0].ItemArray.GetValue(6)) );

char c = strA[0];
if (c >= '1' && c <= '9') {
    // yippee!
} else if (c >= 'A' && c <= 'B') {
    // wee!
}

foreach (DataRow dr in dsDataset.Tables[0])
{
  // Do something with each row.
}

while (dr.MoveNext())
{
  // Do something here.
}

DataSet ds ;
using (OleDbConnection conn = new OleDbConnection("myConnectionDetails"))
{
  using (OleDbDataAdapter cmd = new OleDbDataAdapter ("myCommand", conn))
  {
    conn.Open();
    try
    {
      cmd.Fill(ds);
      cmd.Close();
    }
    finally
    {
      if (conn.State == ConnectionState.Open)
        conn.Close();
    }
  }
}