Typed Dataset parent child relation problem.

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 - Generic OLEDBConnection Hi all, i need to make a connection to a database, but i can't know in advance what kind of database it will be. That can be an oracle database, access database, sql server database, and so on ... My user will create an ODBC DSN and will set it's name in my application. Then i will have only this information : the DSN NAME i thought that odbc can implement a generic way of connection. So i've create an OleDbConnection object : Private theOleDbConnection As OleDbConnection ... theOleDbConnection = New OleDbConnection theOleDbConnection.ConnectionString = ?? what kind of connection string should i use (i've tried some without any result) ? is there's an other way to have a generic connection ?? thanks a lot in advance for your help. Nicolas H. Tag: Typed Dataset parent child relation problem. Tag: 99164
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 - Issue with Managed Oracle Provider in .NET Can any one clarify this issue with Managed Oracle Provider in .NET ? I am trying to run a very simple SQL query using the ExecuteScalar() method of the command object. I get an error stating: ORA-00911: invalid character --------------------Code------------------------ public Object fetchScalar( IDbConnection con, String strSql) { IDbCommand cmd = null; try { //Prepare the Command cmd = con.CreateCommand(); cmd.Connection = con; cmd.CommandText = strSql; cmd.CommandType = System.Data.CommandType.Text; try { cmd.CommandTimeout = 30; Object result = cmd.ExecuteScalar(); return result; } finally { if (null != cmd) cmd.Connection = null; cmd = null; } } catch( Exception e ) { throw new Exception( ERR_CantFetchData, e ); } } -------------------End Code--------------------- --------------------SQL------------------------- select B2.BUS_NAME_ID BusNameId from business_name B1, business_name B2 where B1.BUS_NAME_ID = 2201110001 and B1.BUS_NAME_TYPE_CD = 1004 and B1.ENTITY_ID = B2.ENTITY_ID and B2.BUS_NAME_TYPE_CD = 1001; -------------------End SQL---------------------- ------------------Error Message----------------- Error: ORA-00911: invalid character Module: System.Data.OracleClient at System.Data.OracleClient.OracleConnection.CheckError(OciErrorHandle errorHandle, Int32 rc) at System.Data.OracleClient.OracleCommand.Execute(OciHandle statementHandle, CommandBehavior behavior, Boolean isReader, Boolean needRowid, OciHandle& rowidDescriptor, ArrayList& refCursorParameterOrdinals) at System.Data.OracleClient.OracleCommand.Execute(OciHandle statementHandle, CommandBehavior behavior, Boolean needRowid, OciHandle& rowidDescriptor) at System.Data.OracleClient.OracleCommand.ExecuteScalarInternal(Boolean needCLStype, Boolean needRowid, OciHandle& rowidDescriptor) at System.Data.OracleClient.OracleCommand.ExecuteScalar() -----------------End Error---------------------- Tag: Typed Dataset parent child relation problem. Tag: 99160
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 - Create a Share I have an existing folder. I want to share it so that other user can access this folder. How can I create it from VB.NET Thanks, Richard Tag: Typed Dataset parent child relation problem. Tag: 99155
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 - deleting related records Hi I have strongly typed data set. I want to delete record in one table. It has related tables (it is parent table). How to load all related records from child tables and delete them (and also discover and delete they children records) to have possibility to delete parent record. Thanks Konrad Tag: Typed Dataset parent child relation problem. Tag: 99143
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 - Problem with Access-MemoField that contains Data > 255 characters Hi there! When the Memo field of a Access Database is over 255 characters, OleDbDataAdapter doesn't fill well my DataTable (only the first 255 characters). I tried with OleDbDataReader, GetChars and filling a StringBuilder, and it seems it only has 255 characters; it doesn't reach the rest. Please help! oliver Tag: Typed Dataset parent child relation problem. Tag: 99142
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 - Help-General network error. Check your network documentation. Hi, This is regarding a connection pooling error which I am getting regularly on my shopping cart application. I am getting a message like 'General network error. Check your network documentation. ' on opening the shopping cart ,when it is opened multiple times(7 or 8 times). I had used datareader to retrieve data in the page. Later on I changed it to Dataset and explicitly closed all the connections after retrieving data to the dataset. but it still showing the same message . I am using Microsoft data access block to connect to the database. Please Help. Regards Franco Vincent Tag: Typed Dataset parent child relation problem. Tag: 99139
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 - Error using Container.DataItem("<field>") in Repeater ItemTemplate Hi. I have a straight-forward "OleDbDataReader" object that's been returned from a SELECT statement against an MS Access file. I've tested the DataReader and it has data and is set up right. Now I'm trying to use the ASP.NET Repeater WebControl to display the data. I read the documentation and it says that in the <ItemTemplate> section of the Repeater, I can use the following notation: <ItemTemplate> <%# Container.DataItem("LastName") %> </ItemTemplate> BUT when I do this, I get the following error: "CS0118: 'System.Web.UI.WebControls.RepeaterItem.DataItem' denotes a 'property' where a 'method' was expected" What does this mean? If I replace this notation with: <%# DataBinder.Eval(Container.DataItem, "ID") %> it works, but I've read that that's FAR less efficient. What am I doing wrong? Thanks. Alex Tag: Typed Dataset parent child relation problem. Tag: 99129
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 - How do I force a value into a datatable column? I have a datatable that has been created from a new row in a datagrid. There is a field that is defined in the datatable that is NOT displayed in the datagrid (key field), although the column IS defined in the datatable. I want to force a value into the column before I update the dataAdapter. How do I do this? TIA, Larry Woods Tag: Typed Dataset parent child relation problem. Tag: 99126
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 - interop.ADOX and VB.Net distributions I have a VB.Net application that primarily uses ado.net to manipulate an Access/JET database. It uses adox to create a new empty database if one doesn't already exist. This works fine on the development machine but on trying a test deployment (to a Win2K PC) the step to create the new database fails as an unhandled exception with the error 'Interop.ADOX or one of its dependencies was not found' Now AFAICS interop.adox.dll was included as part of the .msi installation package and can be found in the application folder. MSadox.dll wasn't for some reason packaged (actually I think it was a permissions problem) but I moved it manually to the program folder. Obviously something is not right in this scheme of things. Can anyone suggest where to look first. TIA JGD Tag: Typed Dataset parent child relation problem. Tag: 99125
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 - Is there an Ole DB (or ODBC) provider for Microsoft Works db Is there an Ole DB (or ODBC) provider for Microsoft Works database? *-----------------------* Posted at: www.GroupSrv.com *-----------------------* Tag: Typed Dataset parent child relation problem. Tag: 99121
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 - SQL Select satement question Hi All, This may be a bit of a newbie question with an obvious answer, but I've dug around everywhere and can't find out how to do it. I'm creating a .net web app and have a series of drop-down lists that are all tied to sql tables. The select statement in each of the drop-downs is based on the selection in the previous drop-down (think the same sort of functionality that you see at large automotive sites where you pick the year, and then the make and finally the model). I know that I have to concatenate all of the select statements after the first one, but I don't know how to grab the selected value. The page itself is asp.NET but the code behind everything is vb.NET Thanks in advance, -Mike Tag: Typed Dataset parent child relation problem. Tag: 99119
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 - Select statement based on previous field Hi All, This may be a bit of a newbie question with an obvious answer, but I've dug around everywhere and can't find out how to do it. I'm creating a .net web app and have a series of drop-down lists that are all tied to sql tables. The select statement in each of the drop-downs is based on the selection in the previous drop-down (think the same sort of functionality that you see at large automotive sites where you pick the year, and then the make and finally the model). I know that I have to concatenate all of the select statements after the first one, but I don't know how to grab the selected value. The page itself is asp.NET but the code behind everything is vb.NET Thanks in advance, -Mike Tag: Typed Dataset parent child relation problem. Tag: 99118
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 - remoting/web services passing typed datasets We are testing speed/functionality of remoting and web services while planning a distributed windows forms application. With web services, it is very easy to pass a dataset, but is it possible to pass a typed dataset? If not, is there a way to convert the dataset into the typed dataset? Masa Tag: Typed Dataset parent child relation problem. Tag: 99117
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 - Windows SP2 conflicts with SQL Server Has anybody had problems arise with connecting to SQL Server from a web app after installing SP2? I am getting an access denied error on a web app after installing SP2. I have verified that the ASPNET user is permitted in SQL server. I can connect through Enterprise Mgr., and the database was not affected during the upgrade, however, I am not able to access the DB through Query Analyzer either. Any ideas? *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Typed Dataset parent child relation problem. Tag: 99111
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 - Get Table and Field Names How do I get the names of the tables in a database via ado.net? Once I have the table names, how do I get the names of the Fields for each table? I used to use OpenSchema in vb6 but do not find a correlating command for .net. Thanks. Tag: Typed Dataset parent child relation problem. Tag: 99107
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 - Unspecified Error on MyConnection.Open() to MS Access File Hi. I'm trying to connect to an MS Access .MDB file from ASP.NET (in C#). I've Imported System.Data and System.Data.OleDb. My code looks like: OleDbConnection myConnection = new OleDbConnection(); myConnection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\xyz.mdb"; myConnection.Open(); when I try to do the last line ("myConnection.Open()"), I get an Unspecified Error. I have no idea how to debug this! * Is it because it can't reach the .MDB or that there are permissions problems on it? * Is it because maybe I don't have that exact "Provider" installed (how do I check that)? One more related question: in an ASP.NET .ASPX page, when I provide the path in the connection string, if I want it to be a relative path, how do I determine what OleDb considers to be the current path in which it would look for the file if I provided no path information? Your help is much appreciated. Alex Tag: Typed Dataset parent child relation problem. Tag: 99104
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 - Updating a DataGrid that is disconnected from a data source Hi, I am trying to use a data grid in a web application in which I have three tiers. The DataGrid is not set up to a data source, or a data adapter, so everytime I make a change I send the cell information to another object which forms an SQL query and makes the query to the DB (actually to a DBFacade object). In any case, please see the code I have listed below for my update DataGrid event. With this code, the DB is updated using the old data in the datagrid prior to the users changes, why is this and how can I take the new data out of the grid after the user makes changes? Thanks very much! private void coursesDataGrid_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) { // get primary key courseID TableCell courseIDCell = e.Item.Cells[1]; string courseID = ((TextBox)courseIDCell.Controls[0]).Text; // get section TableCell sectionCell = e.Item.Cells[2]; string section = ((TextBox)sectionCell.Controls[0]).Text; // get semester TableCell semesterCell = e.Item.Cells[3]; string semester = ((TextBox)semesterCell.Controls[0]).Text; // get title TableCell titleCell = e.Item.Cells[4]; string title = ((TextBox)titleCell.Controls[0]).Text; // get school name TableCell schoolNameCell = e.Item.Cells[5]; string schoolName = ((TextBox)schoolNameCell.Controls[0]).Text; // update database here coursesDataGrid.DataSource = courseManager.UpdateCourse(user, schoolName, semester, courseID, title, section); coursesDataGrid.EditItemIndex = -1; coursesDataGrid.DataBind(); } Jon Agiato Tag: Typed Dataset parent child relation problem. Tag: 99103
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 - Connection string does not work from asp.net web application If I run the following code on my development machine as a "Windows Application", it works. If I run the following code on my development machine as an "ASP.NET Web Application", I get the error "SQL Server does not exist or access denied." when trying to open the connection. I would appreciate any assistance in determining why. Private Sub TestAdo() Dim conn As New System.Data.SqlClient.SqlConnection Dim cmd As New System.Data.SqlClient.SqlCommand Dim dr As System.Data.SqlClient.SqlDataReader conn.ConnectionString = "Data Source=np:SQLSERVER1;uid=username;pwd=password;Initial Catalog=STARMT;Connection Timeout=5;" conn.Open() cmd.Connection = conn cmd.CommandText = "select * from customers" dr = cmd.ExecuteReader() Do While dr.Read ' Loop dr.Close() conn.Close() End Sub Thanks in advance. Clay Tag: Typed Dataset parent child relation problem. Tag: 99102
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 - SQLConnection I have few forms that I am trying just to display the data. In each form I need to fire different sqlstatements to get the data. Before executing each sql statement I am opening the connection, executing sqlreader, closing sqlreader and closing the connection. Sometimes I get errors like SQL connection is already open or sqlcon is busy fetching etc. What is the better approach for me to accomplish this. Thanks Tag: Typed Dataset parent child relation problem. Tag: 99097
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 - Missing SourceColumn mapping?! Hi all, having trouble with an Access database, it has a table "Books", the program uses a dataset to work with the database. I set up the schema for the table "Books" as follows: (C#) //////////////////////////// m_dataset.Tables.Add("Books"); DataColumn PrimaryKeyColumn = m_dataset.Tables["Books"].Columns.Add("ID",typeof(int)); m_dataset.Tables["Books"].PrimaryKey = new DataColumn[] {PrimaryKeyColumn}; m_dataset.Tables["Books"].Columns.Add("Name",typeof(string)); m_dataset.Tables["Books"].Columns.Add("ISBN",typeof(string)); m_dataset.Tables["Books"].Columns.Add("Price",typeof(float)); m_dataset.Tables["Books"].Columns.Add("iStock",typeof(int)); m_dataset.Tables["Books"].Columns.Add("mStock",typeof(int)); m_dataset.Tables["Books"].Columns.Add("Barcode",typeof(string)); m_dataset.Tables["Books"].Columns.Add("Description",typeof(string)); //////////////////////////// and then everytime i try to fill it with the dataadapter an exeption "Missing SourceColumn mapping for 'ID' " is thrown. Im totaly in the dark with this one, nothing I try makes any difference, any help would be great! Val Tag: Typed Dataset parent child relation problem. Tag: 99083
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 - Parameters.Add I am new to .Net. I have a windows form in which I am using a Stored Procedure to get the data. I am successful in retrieving the data, however after closing the form and reopening the form I landed in a problem . The error is too many parameters.What I did was I included a line SqlCmd.Parameters.Clear before Parameters.Add - line and I fixed the issue. Can any explain why this is happening and how I can control it? thanks Vb Tag: Typed Dataset parent child relation problem. Tag: 99082
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 - WriteXml & XmlDataDocument questions Hi everyone, I have a question regarding DataSets and the WriteXml method. Specifically, I'm having trouble writing out my DataSet, then reading the contents back in to an XmlDataDocument. For instance, my code reads like this: ///////////////////////// StringWriter l_strWrite = new StringWriter(); XmlDataDocument l_XMLDocument = new XmlDataDocument(); //MyDataSet is a pre-existing DataSet MyDataSet.WriteXml(l_strWrite,System.Data.XmlWriteMode.WriteSchema); l_XMLDocument.LoadXml(l_strWrite.ToString()); //////////////////////// No errors when I run this, however when all is said and done, my XmlDataDocument's DataSet member has zero tables, whereas the original ("MyDataSet") has one table in its collection. Something's not right-- maybe I'm not saving the DataSet correctly via WriteXml()? I realize the XmlDataDocument class has a DataSet member that I can assign to, however in my code I can't just simply set things equal to MyDataSet....I'm trying to write out the DataSet to a string then pass it around from one section of my program to another. Only later on will I create my XmlDataDocument. Maybe I should create a temporary DataSet from my string when the time comes, then assign it to my XMLDataDocument's DataSet member? Sounds like a hack, but maybe it's an option. I don't know. If you have any suggestions or ideas on how I can correctly write out/read in my DataSet to an XMLDataDocument, I'd be glad to hear them. Thanks very much. -Jim Tag: Typed Dataset parent child relation problem. Tag: 99078
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 - Select Top 10 from a DateTable??? Hi! I want to select only 10 rows from a dataTable each time, just as from a database("SELECT TOP 10 FROM orders WHERE ID <100 ORDER BY ID"). for example: DataTable myTable = new DataTable("orders"); DataRow[] rows = myTable.Select("TOP 10 ID < 100"); 1)How can I write the correct statement. 2)Can I ues "TOP" key word or there's other way to do it? P.S. I mean from a dataTable. Thank you very much. :shock: *-----------------------* Posted at: www.GroupSrv.com *-----------------------* Tag: Typed Dataset parent child relation problem. Tag: 99065
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 - Concurrency violation: the UpdateCommand affected 0 records. Wanted to post my scenario about this error message for others to benefit from... I was getting this error on a certain table and could not figure out why to save my life. I use the same data access strategy for all DA objects and was not having the problem with any other object/table. Here's what was going on: The Update proc generated by the Data Adapter Configuration Wizard creates 2 fields for every one... one for the current value and one for the "Original" value. I had a table with these columns: Logon_ID Username Password Original_Username Original_Password You should start to see the problem now. What happened was the DACW creates a parameter for the Username called "Original_Username", then I ALSO had the real field name "Original_Username". ADO.NET got confused and thought that the field had changed because it was looking at the wrong field, and it threw the "Concurrency violation: the UpdateCommand affected 0 records." error. I changed my field names to O_Username and O_Password and it was fixed. I liked to never found this. It was a real problem for a couple days. So, I wanted to share this info. I've had other problems like this stemming from using certain words for/in field names, so I've resolved to, at my next project, come up with a prefix to put in front of all column names. It will be kind of clumbsy when working directly in the Db (SQL), but the names can then be abstracted (the prefix can be stripped) in the business objects. At least it will avoid weird problems like this. Tag: Typed Dataset parent child relation problem. Tag: 99056
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 - how to determine logged on user? I have MSDE2000 using integrated authentication. How can I determine the username of the logged on user from my asp.net app? Tag: Typed Dataset parent child relation problem. Tag: 99053
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 - DataBind problem i made tow combobox one of them filled in page load and the other one fill when the user select a value form the First one but i got this error: "The Column prefix 'System.Data' does not match with a table name or alias name used in the query" and this my code: the First Combobox: SqlConnection cnn = new SqlConnection(); cnn.ConnectionString = DB.ConnectionSTR(DB.Current_DB()); SqlCommand cmd = cnn.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "Select Client_ID,Client_Name From Client"; SqlDataAdapter da = new SqlDataAdapter(); DataTableMapping TblMap; DataColumnMapping ColMap; TblMap = da.TableMappings.Add("Client","Client"); ColMap = TblMap.ColumnMappings.Add("Client_ID","Client_ID"); ColMap = TblMap.ColumnMappings.Add("Client_Name","Client_Name"); da.SelectCommand = cmd; DataSet ds = new DataSet(); da.Fill(ds,"Client"); cboClient_Name.DataSource = ds; cboClient_Name.DisplayMember = "Client.Client_Name"; cboClient_Name.ValueMember = "Client.Client_ID"; The Seconde combobox: SqlConnection cnn = new SqlConnection(); cnn.ConnectionString = DB.ConnectionSTR(DB.Current_DB()); SqlCommand cmd = cnn.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "Select MSA_ID,MSA_Effective_Date From MSA Where Client_ID="+cboClient_Name.SelectedValue.ToString()+""; SqlDataAdapter da = new SqlDataAdapter(); DataTableMapping TblMap; DataColumnMapping ColMap; TblMap = da.TableMappings.Add("MSA","MSA"); ColMap = TblMap.ColumnMappings.Add("MSA_ID","MSA_ID"); ColMap = TblMap.ColumnMappings.Add("MSA_Effective_Date","MSA_Effective_Date"); da.SelectCommand = cmd; DataSet ds = new DataSet(); da.Fill(ds,"MSA"); cboClient_Name.DataSource = ds; cboClient_Name.DisplayMember = "MSA.Client_Name"; cboClient_Name.ValueMember = "MSA.Client_ID"; Tag: Typed Dataset parent child relation problem. Tag: 99050
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 - DataBind problem i made tow combobox one of them filled in page load and the other one fill when the user select a value form the First one but i got this error: "The Column prefix 'System.Data' does not match with a table name or alias name used in the query" and this my code: the First Combobox: SqlConnection cnn = new SqlConnection(); cnn.ConnectionString = DB.ConnectionSTR(DB.Current_DB()); SqlCommand cmd = cnn.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "Select Client_ID,Client_Name From Client"; SqlDataAdapter da = new SqlDataAdapter(); DataTableMapping TblMap; DataColumnMapping ColMap; TblMap = da.TableMappings.Add("Client","Client"); ColMap = TblMap.ColumnMappings.Add("Client_ID","Client_ID"); ColMap = TblMap.ColumnMappings.Add("Client_Name","Client_Name"); da.SelectCommand = cmd; DataSet ds = new DataSet(); da.Fill(ds,"Client"); cboClient_Name.DataSource = ds; cboClient_Name.DisplayMember = "Client.Client_Name"; cboClient_Name.ValueMember = "Client.Client_ID"; The Seconde combobox: SqlConnection cnn = new SqlConnection(); cnn.ConnectionString = DB.ConnectionSTR(DB.Current_DB()); SqlCommand cmd = cnn.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "Select MSA_ID,MSA_Effective_Date From MSA Where Client_ID="+cboClient_Name.SelectedValue.ToString()+""; SqlDataAdapter da = new SqlDataAdapter(); DataTableMapping TblMap; DataColumnMapping ColMap; TblMap = da.TableMappings.Add("MSA","MSA"); ColMap = TblMap.ColumnMappings.Add("MSA_ID","MSA_ID"); ColMap = TblMap.ColumnMappings.Add("MSA_Effective_Date","MSA_Effective_Date"); da.SelectCommand = cmd; DataSet ds = new DataSet(); da.Fill(ds,"MSA"); cboClient_Name.DataSource = ds; cboClient_Name.DisplayMember = "MSA.Client_Name"; cboClient_Name.ValueMember = "MSA.Client_ID"; Tag: Typed Dataset parent child relation problem. Tag: 99049
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 - Performance counters SqlConnection vs ODBC vs OLE DB I'm trying to monitor connection pooling in a web app on our development web server. The connection string is a .Net SqlConnection string. I'm trying to monitor connection pooling via the .Net CLR data SQLClient counters but I am not seeing any connections being made in the pools. (pooling is on by default) Why am I not seeing any of the counters? I did see a reference someplace that said the counters would only show connections made by an ODBC connection string. Can anyone confirm this? Thanks John Tag: Typed Dataset parent child relation problem. Tag: 99047
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 - Still Problem with Dataview.Find Hello, When I Do Desc, It works but everything is backwards. All the records go from Z - A. I need them to go from A - Z and grab the first one it finds. ASC reproduces the behaviour stated below: I am retrieving data from a database "Order By LastName", when I use a dataview to find a Last Name it does not give me the first instance of the Last Name. ie. ADataView.Sort = "LastName" AnInteger=ADataView.find("Smith") BindingContext(ADataView).Position = AnInteger If there are more than one "Smith" in the database it goes to the second one instead of the First one. What I need is for it to go to the first one. Any suggestions will be greatly appreciated. Thanks, Chuck Tag: Typed Dataset parent child relation problem. Tag: 99046
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 - MSDTC Wrap Directly? Looking for any sample code on using MSDTC directly, without inheriting from ServicedComponent. I want to use MSDTC with xcopy deployment, so nothing can be hard-installed into the COM+ catalog or require Administrator rights. OS is XP and Win2003. Thanks. Tag: Typed Dataset parent child relation problem. Tag: 99045
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 - finding row position in a dataview based on multiple keys.... I am trying to find a row in a dataset using the key values (whether it is sorted by them or not) and then move to that row in the dataset. the DataView.Rows.Find(Keys()) works fine to return the row, but then I need to move the CurrencyManager to the correct position for the resulting datarow. Is there a way to move to a record in a dataview based on multiple keys? -- -Rick ________________________________ Hardware, n.: Part of a computer, that when played with long enough, will eventually break. Software, n.: Part of a computer, that when played with long enough, will eventually work. Tag: Typed Dataset parent child relation problem. Tag: 99038
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 - OdbcConnection with compatibility level 2 Hello, is there any way to initialize an OdbcConnection object restricted to ODBC V2 features even though the ODBC driver is version 3? I have a .NET assembly that is used as a COM-Server by another application. That application uses ODBC 2 and the ODBC driver returns the results in the version 2 way. After the app initializes the COM Server an my assembly connects to the same database using the same driver, the ODBC driver returns the result codes in the version 3 way. To the driver the app and the COM-Server appear as one process because it is an Inproc-Server. That confuses the app because statements like "delete from tableXYZ where 1=2" now return SQL_NO_DATA instead of SQL_SUCCESS. Anything but SQL_SUCCESS ist treated as an error by the SQL libs of that app. Sad but true. In the Reflector I discovered OdbcConnection has an internal property IsV3Driver and cache the major version of the driver. But everything seems to be private or internal. Do you have an idea? Any help is appreciated. Tag: Typed Dataset parent child relation problem. Tag: 99037
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 - Calling a Mdi child Form from a modal one The application loads the main form (mdi parent) and then it shows a modal form for validation porpuses. After the user writes the password the validation form closes, and then I need to call a Mdi child form. How can I do this? Tag: Typed Dataset parent child relation problem. Tag: 99032
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 - Update Command I am using parameters etc when populating a dataset using a DataAdapter. I have an Update command of the folllowing form : UPDATE projects SET ID=@ID,Address1=@Address1,Address2=@Address2,Postcode=@Postcode WHERE ID=@ID Where ID is my primary key. When I change Addres1 etc.. then use DataAdapter.Update(changes) everything is updated nicely, however if I change the ID value of one of the rows then use adapter.update(changes) I get a concurrency violation exception, presumably this occurs because I am trying to update the ID value when ID is in the WHERE clause. Is there anything I can do to correct this problem? Thanks, Steven Tag: Typed Dataset parent child relation problem. Tag: 99018
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 - Performance of Find? I was wondering what kind of algorithm is behind the DataRowCollection.Find method, where you are searching by the primary (and unique) key. Can I expect "table-scan"-like performance O(n) or is there some sort of indexing that makes it constant or logarithmic in performance? I'm currently contemplating doing some complex sums, either in the DB (which - of course - has the best performance on the actual calculations), or in my client (which would remove the connection overhead, and improve multiuser-scalability) Jesper. Tag: Typed Dataset parent child relation problem. Tag: 99016
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 - msde error Hi, I install msde 2000 using the command line like this => setup SAPWD="pass" But when I try to create a new database using access sql server database wizard he ask me for a login id and password! First if my password is pass what is the login id? When I try the login id of my computer user name or sa and the password as pass I always get an error message: Connection failed: SQLSTate:28000 SQLserver error:18452 Why??? Did my msde installation is good I set the server name and the msde icon in the try icons is on and running! Thanks! Tag: Typed Dataset parent child relation problem. Tag: 99014
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 - Using a multi-select ListBox to delete records I have a ListBox bound to a DataSet. I'd like to be able to select two or more items in the ListBox and delete the corresponding records in the Access table which serves as the data source. I have figured out how to edit multiple records, by using a Do...Loop construct to check each item in turn, test its state and edit it if it's selected. But I couldn't make that approach work when deleting records, because of course the number of records, and the index of each, changes every time a record is deleted. I know about the For Each...Next construct and the SelectedIndices collection, but I can't figure out how to use them to achieve the goal. Any ideas, anybody? Tag: Typed Dataset parent child relation problem. Tag: 99010
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 - DataSet can't determine 'childs' Is it true that XML in this form is **unusable** for usage by DataSet.ReadXml([file], XmlReadMode.Fragment) and [DataRow][DataColumn].GetChildRows()? Because I found that GetChildsRows() does not work. I am talking about a DataSet which has a xsd schema. Im suspecting currently, that GetChildRows -only- works if there is a primarykey-foreign key relation ship. I DO want to avoid to use the XmlDocument object to read all data! Is there an easy fix for this? The child(s) here is <option> <entry> <value>blah</value> <entries> <option>1</option></option>2</option> </entries> </entry> Tag: Typed Dataset parent child relation problem. Tag: 99008
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 - Performance better with DataSet or DataReader or ...??? Hi, I have a business-entity-classes which are constructed of few primitive types and one DataSet type. For Example: Public class MyClass{ private int id; private string name; private DataSet childrenCollection; â?¦ In my data access layer I want to create an instance based on this class and fill it with data from the DB (MSDE). I have two options in mind and I want to know which would be the best in term of performance. In both options Iâ??m using a single stored procedure with two select statements â?? one for the single row (primitive types) and one for the children collection. For example: SELECT ID, Name from T_Parents WHERE ID= id; SELECT ID, Name from T_Children WHERE ParentID = id; The options are: 1. Fill all the data into a DataSet. As there are two select statements two tables will be created in the DataSet I would be able to copy the values from the first table to my class primitive and the other table to my class DataSet. 2. Use a DataReader and, by looping over the second ResultsSet, build a DataTable row after row. So instead of using the DataSet.Fill method Iâ??ll be â??manuallyâ?? creating the rows and inserting the values based on the results coming from the DataReader. I donâ??t think it matters, but Iâ??m using the data access application bloc v2. If there is another (better) option I havenâ??t thought about Iâ??ll be happy to know. Otherwise I would like to know which one should perform better. Thank you, Gwenda Tag: Typed Dataset parent child relation problem. Tag: 99006
 - 15
 - auto-populate SQLCommand.Parameters collection based on stored-procedure if in VB.NET or C# , if I associate a SQLCommand object with a specific stored-procedure on a specific database on a specific sql-server .... is there a way to trigger auto-population of the SQLCommand.Parameters collection ? (System.Data.SQLClient.SQLParameterCollection) so ... each SQLParameter would have its various properties populated based on the stored-procedure declaration ? Tag: Typed Dataset parent child relation problem. Tag: 99004
 - 16
 - Need help!So strange with DataRow State.. Hi:everybody I meet a very strange problem. I use strong typed DataSet. After I change the row value,the rowstate always UnChanged. Here is the code: dsOrder.order_master[cmMaster.Position].order_no=10; string s dsOrder.order_master[cmMaster.Position].RowState.ToString(); or dsOrder.order_master[0].order_no=10; string s dsOrder.order_master[0].RowState.ToString(); s is always "UnChanged". But in the morning ,It was working very well. I try to change the tables DefaultView' value, the same thing happend,I got confused, Dose anybody met problems like this? Thanks ! Tag: Typed Dataset parent child relation problem. Tag: 99003
 - 17
 - Dispose vs Close Trying to determine if calling Dispose destroys the connection instead of releasing the connection back to the connection pool where a close does release to the connection pool. I have read documentation that made that statement. Most everyone agrees dispose does call close then cleans up some more. But does Dispose destroy the connection and not release back to the pool (when connection pooling is enabled)? Also, does a data layer have to implement the IDisposable interface when working with connections (closing and releasing a connection) in the component? Our apps do create and pass in a connection when working with transactions but for the selects we use the datareader with the CloseConnection behavior and some datasets with the disconnection taking place. And one more item, we have encrypted connection strings in our web.config file. Is using connection factories better and is there any explaination on how to build the factory? Thanks Tag: Typed Dataset parent child relation problem. Tag: 99000
 - 18
 - Invalid cast from DBNull to Decimal This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C4C82C.DD082030 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I must be just looking at this for so long I am going blind. Here is = part of the code: For Each _lRow In _laRow Me.DepYrStraightLine.DepreciationYearID =3D = CType((_lRow.Item("DepreciationYearID")), System.Guid) Me.DepYrStraightLine.DepreciationID =3D = CType((_lRow.Item("DepreciationID")), System.Guid) Me.DepYrStraightLine.DepreciationTypeID =3D = CType((_lRow.Item("DepreciationTypeID")), Integer) Me.DepYrStraightLine.Year1 =3D CType((_lRow.Item("Year1")), Decimal) Me.DepYrStraightLine.Year1BookValue =3D = CType((_lRow.Item("Year1BookValue")), Decimal) Me.DepYrStraightLine.Year2 =3D CType((_lRow.Item("Year2")), Decimal) Me.DepYrStraightLine.Year2BookValue =3D = CType((_lRow.Item("Year2BookValue")), Decimal) The rows (or columns rather) Year1BookValue and Year2BookValue are two = new columns I added to the table. I have gone all the way from the = stored procs and tables and through the code to make sure everything was = identical on the column data type settings. The data type is just like = 'Year1' and 'Year2'. Decimal, default value of (0.0) 27 precision and 15 = scale. When I step through with the debugger and get to any of the new columns, = I get an invalid cast exception that says the cast to DBNull from = Decimal is not allowed. However, the 'Year1'/'Year2 fields have 0D in = them. Any idea what could be causing this problem? Thanks. Norton ------=_NextPart_000_0008_01C4C82C.DD082030 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2523" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>I must be just looking at this for so = long I am=20 going blind. Here is part of the code:</DIV> <DIV> </DIV> <DIV> For Each _lRow In _laRow Me.DepYrStraightLine.DepreciationYearID = =3D=20 CType((_lRow.Item("DepreciationYearID")), System.Guid) <FONT=20 face=3DArial size=3D2>Me.DepYrStraightLine.DepreciationID =3D=20 CType((_lRow.Item("DepreciationID")), System.Guid) Me.DepYrStraightLine.DepreciationTypeID =3D=20 CType((_lRow.Item("DepreciationTypeID")), Integer) Me.DepYrStraightLine.Year1 =3D CType((_lRow.Item("Year1")),=20 Decimal) Me.DepYrStraightLine.Year1BookValue =3D=20 CType((_lRow.Item("Year1BookValue")), Decimal) Me.DepYrStraightLine.Year2 =3D CType((_lRow.Item("Year2")),=20 Decimal) Me.DepYrStraightLine.Year2BookValue =3D=20 CType((_lRow.Item("Year2BookValue")), Decimal) The rows (or columns rather) = Year1BookValue and=20 Year2BookValue are two new columns I added to the table. I have gone all = the way=20 from the stored procs and tables and through the code to make sure = everything=20 was identical on the column data type settings. The data type is just = like=20 'Year1' and 'Year2'. Decimal, default value of (0.0) 27 precision and 15 = scale. When I step through with the debugger and = get to any=20 of the new columns, I get an invalid cast exception that says the cast = to DBNull=20 from Decimal is not allowed. However, the 'Year1'/'Year2 fields have 0D = in=20 them. Any idea what could be causing this=20 problem? Thanks. Norton</DIV></BODY></HTML> ------=_NextPart_000_0008_01C4C82C.DD082030-- Tag: Typed Dataset parent child relation problem. Tag: 98999
 - 19
 - Transfer Dataset / DataTable / Datareader Info to Excel Spreadsheet Is there some type of command that will allow me to transfer records in a datatable/dataset/ or datareader to an Excel Spreadsheet? Or do I have to do some type of manual iteration through a DataReader / DataTable? L Johnson Tag: Typed Dataset parent child relation problem. Tag: 98993
 - 20
 - DataView.Find Hello, I am retrieving data from a database "Order By LastName", when I use a dataview to find a Last Name it does not give me the first instance of the Last Name. ie. ADataView.Sort = "LastName" AnInteger=ADataView.find("Smith") BindingContext(ADataView).Position = AnInteger If there are more than one "Smith" in the database it goes to the second one instead of the First one. What I need is for it to go to the first one. Any suggestions will be greatly appreciated. Thanks, Chuck Tag: Typed Dataset parent child relation problem. Tag: 98991
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 - urgent: connection pooling error Hi all, I have a web service that opens a sqlconnection to the db and does some work. Just recently I have begun getting the following error on a frequent basis: Timeout expired.The timeout period elapsed prior to obtaining a connection from the pool.This may have occurred because all pooled connections were in use and max pool size was reached. I have verified that my web service is closing connections. Why is this happening? Can I increase the max pool size? How? thanks, Param Tag: Typed Dataset parent child relation problem. Tag: 98987
 - 22
 - insert data help! Hello! I use a DataAdapeter ( and DataSet) to access to my database. I have get all data well (fill the dataset), but when I try to update it, I got nothing! The code is below. Pls help me conn = new SqlConnection(strConn); sda = new SqlDataAdapter(); ds = new DataSet(); ds.DataSetName = "ds"; string tmp = "SELECT * FROM Personal"; SqlCommand selectCmd = new SqlCommand(tmp, conn); sda.SelectCommand = selectCmd; sda.Fill(ds, "Personal"); conn.Close(); SqlCommand insertCmd = new SqlCommand("InsertNewPerson", sda.SelectCommand.Connection); insertCmd.CommandType = CommandType.StoredProcedure; SqlParameter[] parms = new SqlParameter[4]; parms[0] = new SqlParameter("@name", SqlDbType.NVarChar, 50); parms[1] = new SqlParameter("@code", SqlDbType.Char, 4); parms[2] = new SqlParameter("@type", SqlDbType.Char, 1); parms[3] = new SqlParameter("@isAvailable", SqlDbType.TinyInt); for (int i = 0; i < 4; i++) insertCmd.Parameters.Add(parms[i]); insertCmd.Parameters[0].Value = "NewName"; insertCmd.Parameters[1].Value = "0000"; insertCmd.Parameters[2].Value = "M"; insertCmd.Parameters[3].Value = 1; sda.Update(ds,"Personal"); the storedProc: REATE PROCEDURE InsertNewPerson( @name nvarchar(50), @code char(4), @type char(1), @isAvailable tinyint )AS insert into Personal values(@name, @code, @type, @isAvailable) GO Tag: Typed Dataset parent child relation problem. Tag: 98986
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 - Mdi child controls I need to know what control (within a mdi child form) has focus when the user clicks on a toolbar buttom from the mdi parent form, If that's make sense... =) Tag: Typed Dataset parent child relation problem. Tag: 98984
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 - OBJ REF NOT SET TO AN INSTANCE OF AN OBJ guys ive been pouring over this for hours. i'm bascially copying code from another working asp.net program and i just cant see what im missing. the logon procedure certainly finds the obj reference yet when i go to execute the sql query string, i keep getting this message. and im basically doin the exact same thing from the other program, just querying a different table, so why the ERROR?? here's the code if anyone can take the time to figure out what im missing. i've looked at all the variables Private Sub btnExport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExport.Click sql = "select * from cont_payroll where empl_id='0322K' and ppe="15-oct-04'" Try Dim oracon As New OracleConnection("Server=atserver;Uid=rik;Pwd=winter_04") Dim ds a new Dataset oracon.Open() ds.Clear() ds.EnforceConstraints = False Dim myCmd As New OracleCommand myCmd.Connection = oracon myCmd.CommandText = sql myCmd.CommandType = CommandType.Text Dim myDa As New OracleDataAdapter(myCmd) myDa.Fill(ds) If ds.Tables.Count = 0 Then lblLogon.Text = "Nothing found" ElseIf ds.Tables.Count >= 1 Then Dg1.DataSource = ds.Tables(0) Dg1.DataBind() Else End If oracon.Close() Catch ex As Exception lblLogon.Text = ex.Message End Try End Sub End Class ********************************************************************** Sent via Fuzzy Software @ http://www.fuzzysoftware.com/ Comprehensive, categorised, searchable collection of links to ASP & ASP.NET resources... Tag: Typed Dataset parent child relation problem. Tag: 98983
 - 25
 - Strategy Question: Semi-Structured Data Comparisons All, I'm hoping one of you Xml or Data gurus can offer an opinion. I'm working on an app to basically compare two semi-structured data files (e.g. Excel / CSV) to one another. But I need to compare them as if they were datatables... (ie a simple diff type tool won't work)... More specifically, the process I envision so far is: 1) Read in two files -- if Excel select appropriate sheet (would also require users to structure their worksheets as tables -- ie no mixed data so common with Excel) 2) Determine worksheet -- if Excel 4) Scan for columns 5) Have user determine which is source and which is target (or file being compared) 6) Have user match one or more "key" columns between two files -- eg Source File "ID" column = Target File "UserID" column (allows for arbitray column names) 7) Have user select (similar to above) columns to compare (simple text, integer or boolean equality for now) 8) Run the comparison determining -- a) Rows in one but not the other file (based on the Keys) b) Rows with matching keys but non-matching (changed) comparison columns c) Rows that match key / compare columns Here's what I'm asking: - I know how to do / have written 1 - 7. - I also know how to do 8 above via brute force -- eg going from the source, read row by row, column by column and comparing keys and comparison columns between the two... * What do you recommend as the data structure? Currently using an OleDB generated dataset. Does Xml or a collection make more sense? * If dataset or Xml, is there a better way than brute force? Dataview with Find? Merge and detect differences? Would appreciate any advice from anyone who's been there before. One concern with brute force approach is that these files could contain hundreds to thousands of rows (yes, I wish my fellow employees would do more with databases) -- which, worst case scenario of, say, a thousand rows in each file results in potentially, I believe, 1 Million comparisons.... Any thoughts, comments, suggestions? Conversion of source data to Access, SQL Server, Oracle not an option......tried it already (politics).... thanks in advance, tim Tag: Typed Dataset parent child relation problem. Tag: 98975

Hi,

I created a XSD shemas defenition for two tables that has parent child
relation. I create the shemas by using XMLSpy. The relation is well deffine
in xsd file.

I generated a Types Dataset form that xsd file by using XSD utilty of .Net
framework.
The data relation seems to be well define, a DataRalation is add to the
typed dataset source code..

But if I create an XMLDataDocument from that dataset the parent child
relation is not respected in the generated XML.
ex:.
It must Get this.
<table1>
<field1></field1>
<field2></field2>
<field3></field3>
<table2>
<field1></field1>
<field2></field2>
</table2>
</table1>

But a get That

<table1>
<field1></field1>
<field2></field2>
<field3></field3>
</table1>
<table2>
<field1></field1>
<field2></field2>
</table2>

What can be the problem with the typed dataset that make the datarelation
not respected?

Regards

Alain Martineau
Publishing Business System

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