Could not save; currently locked by another user [Answered]RSS

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  uid571490

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  Could not save; currently locked by another user

  Apr 16, 2014 06:56 AM|uid571490|LINK

  Hi,
  when I tried to update one record of table (in host) i faced this error :
  Could not save; currently locked by another user
  
  I tried again and again but faced the same problem (but i could insert a new row and update it at the same table).
  then i cleared my browser history and error gone.

  I found this error occures when two user trying to access the same table at the same time, but what is relation between history of browser and this error?
  
  what was the problem????

• • Reply
  hans_v

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  Re: Could not save; currently locked by another user

  Apr 16, 2014 07:15 AM|hans_v|LINK

  Most likely, you're not closing and disposing the connection properly. Use the syntax in this article:

  http://www.mikesdotnetting.com/Article/26/Parameter-Queries-in-ASP.NET-with-MS-Access

  If this doesn't help. please show us your code?

• • Reply
  uid571490

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  247 Posts

  Re: Could not save; currently locked by another user

  Apr 16, 2014 09:39 AM|uid571490|LINK

  Thanks

  as I said by clearing the history error gone, so I can't test again until face that situation again!
  
  by the way this is codes

  namespace DAL
  {
      public class DALBase
      {
          public static string ConnectionString
          {
              get { return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString; }
          }
  
          public int ExecuteNoneQuery(CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
          {
              int retVal = 0;
              using (OleDbConnection con = new OleDbConnection(ConnectionString))
              {
                  OleDbCommand cmd = new OleDbCommand();
                  cmd.Connection = con;
                  cmd.CommandType = commandType;
                  cmd.CommandText = commandText;
                  cmd.Parameters.AddRange(commandParameters);
                  con.Open();
                  try
                  {
                      retVal = cmd.ExecuteNonQuery();
                  }
                  catch (Exception exp)
                  {
                      throw exp;
                  }
                  finally
                  {
                      con.Close();
                  }
                  return retVal;
              }
          }
      }
  
  }

  below code is in Services Class
  
  

  public int UpdateServiceWithoutPic(int id, int ParentID, string STitle, string SContent)
          {
              string strUpdate = "update Services set ParentID =@ParentID , STitle =@STitle , SContent = @SContent where SID =@SID";
              return ExecuteNoneQuery(CommandType.Text, strUpdate, new OleDbParameter[]{
                  new OleDbParameter("@ParentID" , ParentID),
                  new OleDbParameter("@STitle" , STitle),
                  new OleDbParameter("@SContent" , SContent),
                  new OleDbParameter("@SID" , id),
              });
          }
  

  Services services = new Services();
  
  int i = services.UpdateServiceWithoutPic(Convert.ToInt32(Request.QueryString["id"]), Convert.ToInt32(drpParent.SelectedValue), txtTitle.Text, TextBox1.Text);
                  if (i != 0)
                  {
                      lblMessage.Text = "Success!!";
                      BindMenu();
                      dtlSearch.DataSource = null;
                      dtlSearch.DataBind();
                  }
                  else
                  {
                      lblMessage.Text = "Error";
                      if (File.Exists(Request.PhysicalApplicationPath + "Images\\Services\\" + PicName))
                      {
                          File.Delete(Request.PhysicalApplicationPath + "Images\\Services\\" + PicName);
                      }
                  }
  

  at least I found it can be related to coding. thanks a lot!

• • Reply
  Kevin Shen -...

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  Re: Could not save; currently locked by another user

  Apr 16, 2014 11:00 PM|Kevin Shen - MSFT|LINK

  Hi Bahare Feizi,

  About your code,It seems that you update or insert data using  ExecuteNoneQuery Method

  But you didn ‘t open transaction and didn’t  commit changes to the database .

  Please try the code below:

  OleDbTransaction transaction = con.BeginTransaction(IsolationLevel.ReadCommitted);
  cmd.Transaction=transaction;
  try{
     retVal=cmd.ExecuteNonQuery();
     transaction.Commit();
  }catch(Exception e){
  
    transaction.Rollback();
  }
  finally{
      con.Close();
  }
  

   

  More details about Transaction,please refer to link below:

  http://msdn.microsoft.com/en-us/library/93ehy0z8(v=vs.110).aspx

  If it doesn’t work ,please refer to the link below, try to use the methods provide:

  http://support.microsoft.com/kb/918578

  Hope it can help you.

  Best Regards,

  Kevin Shen.

  Please Mark as Answer If it help you,thanks
• • Reply
  uid571490

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  247 Posts

  Re: Could not save; currently locked by another user

  Apr 17, 2014 01:04 AM|uid571490|LINK

  Thanks,

  I use Transaction when I need to do more than one Insert, update, delete at the same time. here I do one update so I dont think transaction is needed here.

  and I think second link is usful when we use access database in local not host.