public class bdDetailsSub // Подразделения
  {
     public object id_sub { get; set; }
     public object name_sub { get; set; }
     public object definition_sub { get; set; }
  {

 public class bdConnection
  {
     private string connectionString;

	 public bdConnection()
	  {
          connectionString = WebConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
	  }

     public bdConnection(string connectionString)
      {
          this.connectionString = connectionString;
      }
string mess = "Обнаружена ошибка в методе ";
...
    public void updateSub(int id_sub, string name_sub, string definition_sub) // обновление записи
      {
          SqlConnection updSub = new SqlConnection(connectionString);
          SqlCommand queryUpdSub = new SqlCommand("updateSubunit", updSub);
          queryUpdSub.CommandType = CommandType.StoredProcedure;
          queryUpdSub.Parameters.AddWithValue("@ID_SUB", id_sub);
          queryUpdSub.Parameters.AddWithValue("@NAME_SUB", name_sub);
          queryUpdSub.Parameters.AddWithValue("@DEFINITION", definition_sub);
          SqlDataAdapter daSub = new SqlDataAdapter(queryUpdSub.CommandText, updSub);
          DataSet dsSub = new DataSet();
           try
            {
                updSub.Open();
                queryUpdSub.ExecuteNonQuery();
            }
           catch
            {
                throw new ApplicationException(mess + "updateSub");
            } 
           finally
            {
                updSub.Close();
            } 
      }

         <asp:ObjectDataSource ID="dsSub" runat="server" InsertMethod="insertSub" SelectMethod="selectSub" TypeName="bdConnection" UpdateMethod="updateSub" DeleteMethod="deleteSub">
             <DeleteParameters>
                 <asp:Parameter Name="id_sub" Type="Int32" />
             </DeleteParameters>
             <InsertParameters>
                 <asp:Parameter Name="nameSub" Type="String" />
                 <asp:Parameter Name="defSub" Type="String" />
             </InsertParameters>
             <UpdateParameters>
                 <asp:Parameter Name="id_sub" Type="Int32" />
                 <asp:Parameter Name="name_sub" Type="String" />
                 <asp:Parameter Name="definition_sub" Type="String" />
             </UpdateParameters>
         </asp:ObjectDataSource>