Public Overrides Function GetUsersInRole(rolename As String) As String() 
  If rolename Is Nothing OrElse rolename = "" Then _
    Throw New ProviderException("Role name cannot be empty or null.")
  If Not RoleExists(rolename) Then _
    Throw New ProviderException("Role does not exist.")

  Dim tmpUserNames As String = ""

  Dim conn As OdbcConnection = New OdbcConnection(connectionString)
  Dim cmd As OdbcCommand = New OdbcCommand("SELECT Username FROM [" & usersInRolesTable & "]" & _
                                           " WHERE Rolename = ? AND ApplicationName = ?", conn)

  cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename
  cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName

  Dim reader As OdbcDataReader = Nothing

  Try
    conn.Open()

    reader = cmd.ExecuteReader()

    Do While reader.Read()
      tmpUserNames &= reader.GetString(0) + ","
    Loop
  Catch e As OdbcException
    ' Handle exception.
  Finally
    If Not reader Is Nothing Then reader.Close()
    conn.Close()      
  End Try

  If tmpUserNames.Length > 0 Then
    ' Remove trailing comma.
    tmpUserNames = tmpUserNames.Substring(0, tmpUserNames.Length - 1)
    Return tmpUserNames.Split(CChar(","))
  End If

  Return New String() {}
End Function

public override string[] GetUsersInRole(string rolename)
{
  if (rolename == null || rolename == "")
    throw new ProviderException("Role name cannot be empty or null.");
  if (!RoleExists(rolename))
    throw new ProviderException("Role does not exist.");

  string tmpUserNames = "";

  OdbcConnection conn = new OdbcConnection(connectionString);
  OdbcCommand cmd = new OdbcCommand("SELECT Username FROM [" + usersInRolesTable + "]"  +
                                    " WHERE Rolename = ? AND ApplicationName = ?", conn);

  cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename;
  cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;

  OdbcDataReader reader = null;

  try
  {
    conn.Open();

    reader = cmd.ExecuteReader();

    while (reader.Read())
    {
      tmpUserNames += reader.GetString(0) + ",";
    }
  }
  catch (OdbcException)
  {
    // Handle exception.
  }
  finally
  {
    if (reader != null) { reader.Close(); }
    conn.Close();      
  }

  if (tmpUserNames.Length > 0)
  {
    // Remove trailing comma.
    tmpUserNames = tmpUserNames.Substring(0, tmpUserNames.Length - 1);
    return tmpUserNames.Split(',');
  }

  return new string[0];
}