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Pls help me urgent - Problem GridDataBoundGrid saving through dataset Remoting

Thread ID:





7366 Sep 23,2003 03:56 AM UTC Oct 8,2003 06:44 AM UTC Windows Forms 6
Tags: GridControl
Administrator [Syncfusion]
Asked On September 23, 2003 03:56 AM UTC

Hi we have a appplication say Order Entry which requires a dataset "order" contains two table ordermas,ordertrans,orderdelivery i am binding the ordertrans table to datagrid i am binging the orderdelivery table to another datagrid i m having a BL Class OrderBL which will take this dataset for the operations. once the user enters information in the screen and fills two datagrids and send the dataset to BL where it is remoted i m reading the dataset in DA class and saving the data to database using insert statements all working fine. Here comes the problem Now the screen is still in edit mode, so i will put another entry in orderdelivery grid, when i try to save the record, exception thrown at the place, while we retrive the values from dataset against grid rows in grid there are two rows but in the dataset it is 1 row we entered previously. This is the problem If any of my sentence is not clear please reply i belive some of the existing users might have implemented remoting with sycnfusion grids Thanks Rajaraman

Paul Laudeman
Replied On September 29, 2003 03:20 PM UTC

Where is the exception being thrown? In the grid, your form, or your business or data class?

Administrator [Syncfusion]
Replied On October 7, 2003 03:24 AM UTC

Hi Thanks for your reply. Please explain me further. this is the code at client we face the exception, Private Sub LoadDealCostFromScreen() Dim costRow As DataRow() Dim intCount As Integer 'In Cost Grid set UOMID to NULL if FLAT is selected and DELETE if cost_id is empty/null For intCount = 1 To tpecost.gceCost.Model.RowCount - 1 costRow = ds.Deal_cost.Select("sequence_no = '" & tpecost.gceCost.Model(intCount, COS_SEQUENCE_NO).Text & "'") If costRow(0).Item("cost_id") Is System.DBNull.Value OrElse Trim(CType(costRow(0).Item("cost_id"), String)) = "" Then costRow(0).Delete() Else If Not costRow(0).Item("UOM_ID") Is System.DBNull.Value Then If Trim(CType(costRow(0).Item("UOM_ID"), String)) = "" Then costRow(0).Item("UOM_ID") = System.DBNull.Value End If End If End If Next 'tpecost.gceCost.rese() tpecost.gceCost.CommitChanges() End Sub ================================= --->If costRow(0).Item............ this row i get the exception since the dataset sequence numbers doesnot match with grid's model sequence numbers, it means that the grid's model not getting refreshed when we remote the dataset bound with grid simultaneously when we send the dataset to remote class as ByRef parameter. Thanks Rajaraman

Replied On October 7, 2003 01:08 PM UTC

Hi Rajaraman, It doesn't matter if you send the DataSet ByRef because it inherits from MarshalByValue. That means that the dataset will be copied to the remoting server. What we do is: - use DataSet.GetChanges() to get the changed rows - return the updated data to the client - merge the updated data to the original dataset Don't forget to cleanup any inserted data if the ID will be changed by database(IDENTITY in SQLSERVER), because these rows are still in your local dataset. Hope this helps Thomas

Administrator [Syncfusion]
Replied On October 8, 2003 12:56 AM UTC

Hi Thomas, I got your angle, it makes me more clear. But the real problem is the dataset we are sending to remoting server as Byref got reflected the changes in the client. But the grid attached is not getting refreshed is the main problem. Can you help me now? Thanks Rajaraman

Replied On October 8, 2003 04:15 AM UTC

Hi Rajaraman, Please send me more details, some source code which shows where you send the DataSet to the server and the server method itselft. Do you use SAO or CAO(server or client activated objects)? We use remoting too and we try the approach to send only the changed data over the wire and merge the result to the local DataSet. You have to know that all data of the MarshalByValue object will be serialized, also the values of the instance variables. Why I should send unused data to the server? If you have 50 DataRows in a DataSet and you modify only 2 rows, it's not a good practise to send the whole dataset to the server. The next point is to use stream compression and the binary formatter, otherwise the amount of data is to high. All this things are briefly described in book of Ingo Rammer. Tip: the book Advanced .NET Remoting from Ingo Rammer is a good source for questions around remoting. ISBN is 1-59059-025-2 Regards, Thomas

Administrator [Syncfusion]
Replied On October 8, 2003 06:44 AM UTC

Hi thanks once again, you are taking more steps to make me understand the situation. i m just trying remoting with a sample 1 row in a grid, let us assume we always send 1 row to database, I am successful with remoting now. i got the data back from remoting server. since i bind the dataset with sync grid, i expected that the changes we have done in dataset will reflect in grid too, but not exactly. regarding remoting recommendations, i agree with everything info rammer consulting website says. since i am just testing a sample. i want my problem could be solved easily, i.e dataset changes should reflect in the grid.model(row,col).text access.. Thanks Rajaraman


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