Pros and Cons

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  - 1
    - Custom DataAdapter Class Hi All, I'm tryin' to create a new DataAdapter class. This class inherits from System.Data.Common.DbDataAdapter and implements the following interfaces: IDbDataAdapter and ICloneable. Here is the class declaration and a simplified version of the constructor called by VS.NET: [Serializable()] public class PIDataAdapter : System.Data.Common.DbDataAdapter, IDbDataAdapter, ICloneable { public PIDataAdapter() { try { this.mobjSqlDataAdapter = new System.Data.SqlClient.SqlDataAdapter(); this.miAdapter = (IDbDataAdapter) this.mobjSqlDataAdapter; this.SelectCommand = (IDbCommand) new System.Data.SqlClient.SqlCommand(); } catch { } } ... } The code compiles ok and I can even add an instance of this class to a web form designer, but there are some things that are not Ok. Here are they: 1. The SelectCommand property of the class doesn't get initialized in the code-behind file of the page I add it to. Is the constructor the right place for doing this? or do I have to catch any event for doing the initialization? How to write the values of the initialization in the code- behind file of the page where I add the component? 2. When I right click the PIDataAdapter instance, the following options are NOT present in the context menu: Configure DataAdapter..., Generate Dateset..., Preview Data... What am I doing wrong? Could anyone please help me? I've spent a lot of time trying to figure out what is wrong but didn't get anywhere ... Thanks in advance, Best Regards, Jeverson Tag: Pros and Cons Tag: 63054
  - 2
    - DataView not writing changes to DataSet???? Greetings, I have a textbox control with has a binding to a DataView (which always has only one row). Changes to the row are persisted during the lifetime of the DataSet/DataTable which underlies the DataView. However when I use MyDataAdaptor.update() the change is ignored. When I programmatically inspect data in the row, I see the new value, but when I look ats it rowstate this is set to "unchanged". Further info: if I use editbegin() and editend() the rowstate is changed to modified. Update then catches the change and updates the database. The DataView is being used to filter to a single record to supply a form (sorting on an index value of another control). So the filter is being changed frequently before Update is called. However the changes persist when rows are revisited. I have another textbox control on the same form, using a different dataview - changes to it are caught and passed on to the update. I see no differences in the properties of the controls or the dataveiws. I don't think this matters but the data type of the column in the database is int, while the textbox is string. Any ideas? Tag: Pros and Cons Tag: 63052
  - 3
    - MSDE Most Misterious of Egipt Pyramid....... Dear friend, I'm using MSDE and VB.Net My problem is that when try to connect at database message box say me: "SQL server don't exist or denide access". Now: I have reistall Msdn but nothing is changed I have manually change login autentication mode from Windows NT to SQL (article 285097) but nothing is changed I have try many string connection mode. This is the last: Imports System.Data.SqlClient . . Try Dim conn As New SqlConnection("Server=Home/VSdotNET; Database=master; User Id=sa; Password=;") conn.Open() If (conn.State = ConnectionState.Open) Then MessageBox.Show("Connection opened successfully") End If conn.Close() Catch ex As SqlException MessageBox.Show(ex.Message) End Try My question is: How I can verify the correct installation and functionality of MSDE ( I have WinXP) How I can set Login and Password on MSDE so to be shure of their value? Tag: Pros and Cons Tag: 63048
  - 4
    - Using Strongly Typed Datasets Environment: VS.NET 2003; VB, Access 2003 database. The application allows users to specify the path/filename and the table name at runtime. I am trying to figure out how I can use a strongly typed dataset in this environment. If I add an OleDBDataAdapter to my project and then create a dataset from that the table name is embedded in the generated code. I believe that changing the file/path is accomplished by making the connection string use a variable that contains the user's path/filename but I am not sure how to handle the fact that the table name changes at runtime. Can anyone point me to some documentation or examples that will help me understand how to do this? -- ------------------------------------ Wayne Wengert wayne@wengert.org Tag: Pros and Cons Tag: 63039
  - 5
    - Passing Null Values via a SQLCommand.Parameter I use stored procedures in most of my programs and in many instances one or more of the parameters being passed can be null. I am looking for the most efficent way to test for a null value then pass it to the parameter object. Here is an example of what I do now, paying special attention to the Parameter functions: Sub AddRecord (byval FirstName as string, byval LastName as string) Dim cnn as new SQLClient.SQLConnection(strcnn) Dim cmd as new SQLClient.SQLCommand cnn.open : cmd.Connection = cnn : cmd.CommandType = adStoredProcedure cmd.CommandText = "spAddRecord" If Trim(FirstName) <> "" Then cmd.Parameters.Add("@FirstName",sqldbtype.varchar).Value = FirstName Else cmd.Parameters.Add("@FirstName",sqldbtype.varchar).Value = System.DBNull.Value End If If Trim(LastName) <> "" Then cmd.Parameters.Add("@LastName",sqldbtype.varchar).Value = LastName Else cmd.Parameters.Add("@LastName",sqldbtype.varchar).Value = System.DBNull.Value End IF cmd.ExecuteNonQuery cnn.close : cnn = Nothing : cmd=Nothing End Sub My questions are: 1. How can I test for Null values in other data type. 2. Is there a better way to do this? I haven't found any real soild documentation on this on the web or in my VB.Net and VS.Net books. Thanks, Tom Tag: Pros and Cons Tag: 63038
  - 6
    - Is this RowFilter + edit operation permissible? What happens if a change is made to the column value on which the RowFilter is based? Does the row "fall out" of the filtered view? Dim OldPartId as String = "42" Dim Dv As DataView = New DataView(MyTable) Dv.RowFilter = "PartID = " + OldPartID + " AND Qty > 0" Dim rv As DataRowView For Each rv In Dv rv.BeginEdit rv("Qty") = 0 rv.EndEdit '// this row now does not meet '// the filter criterion Qty > 0 '// is it still in the view? Next Tag: Pros and Cons Tag: 63036
  - 7
    - Datarow update Hello: I am trying to change a a value in my datarow column ["EmailSent"] from "no" to "yes"... I would like to do it inside my loop... Does anyone have any suggestions on how to do it. Thank you very much for your help... I have placed the code here: private void Page_Load(object sender, System.EventArgs e) { if(!Page.IsPostBack) { string path = Server.MapPath("requests.xml"); ds.ReadXml(path); foreach (DataRow Ord in ds.Tables["request"].Rows) { string id = Ord["id"].ToString(); string name = Ord["Name"].ToString(); string email = Ord["Email"].ToString(); string emailSent = Ord["EmailSent"].ToString(); string apptSetDate = Ord["dateTime"].ToString(); string date1 = Ord["Date"].ToString(); string time = Ord["Time"].ToString(); string ampm = Ord["AmOrPm"].ToString(); string procedure = Ord["jobCode"].ToString(); string date2 = System.DateTime.Today.AddDays (3).ToShortDateString(); int dog = compareDates(date1,date2); if(dog == 0 && emailSent == "no") { try { MailMessage Mailer = new MailMessage(); Mailer.From = "johnpyke@avonlakedental.com"; Mailer.To = email; Mailer.Bcc = "t_wasserman@lycos.com"; Mailer.Subject = "Avon Lake Dental Appointment Reminder"; string picPath = Request.QueryString.ToString(); string strBody = "Hello " + name + ". This is just a note to remind you of " + "your appointment at " + time + ampm + " on " + date1 + " for a " + procedure + ". This email reminder was set for you on " + apptSetDate + "."; Mailer.Body = strBody; Mailer.BodyFormat = System.Web.Mail.MailFormat.Text; SmtpMail.SmtpServer = "smtp- gh.AVONLAKEDENTAL.COM"; SmtpMail.Send(Mailer); //Change Value of EmailSent = "yes" } catch (Exception ex) { MailMessage Mailer = new MailMessage(); Mailer.From = "johnpyke@avonlakedental.com"; Mailer.To = "t_wasserman@lycos.com"; Mailer.Subject = "Avon Lake Dental Email Problem"; string strBody = "There was an error emailing out the Appointments. " + " Here is the message " + ex.Message; Mailer.Body = strBody; Mailer.BodyFormat = System.Web.Mail.MailFormat.Text; SmtpMail.SmtpServer = "smtp- gh.AVONLAKEDENTAL.COM"; SmtpMail.Send(Mailer); } ds.AcceptChanges(); } } } } Tag: Pros and Cons Tag: 63032
  - 8
    - Extending Typed DataTables I am facing the following problem in my applications and would like suggestions from you guys. My database schema has changed many times over the years and keeps chaging frequently according to specific client needs. My business layer (webservices) returns datasets to the thick client. The problem is that as the database changes so often, more than 800 datasets will have to be changed everytime. The solution suggested was as follows: a) Create 1 DataTable for each TABLE in the database. b) Create own DataSet for each visible screen or processing function by addind DataTables to this DataSet. c) Add Ref Contraints manually to this custom DataSet. This way, if the database changes, only one single DataTable class (schema) in the application will have to be changed. Now my problem is that i want to use Typed Datasets and Typed DataTables. What would be the best solution for this scenario. As mentioned on MSDN, DataTables can be instantiated independent of DataSets. In this case, the schema for the DataTable and the constraints are added manually in the code. But I could not find anything about extending Typed DataTables and using them independent of the DataSet. There is a powertoy by Shawn Wildermuth that helps you extend Typed DataSets, but i couldn't extrapolate his ideas to fit my requirements. Any ideas what the best thing for me would be ? Thanks, Nishith Tag: Pros and Cons Tag: 63013
  - 9
    - Translating XML to database hello , i am working on ASP.NET & C#. I want to insert/update/delete some datas to the database. the datas are based on the object. For example class Person { string name, address, pincode; }; i have related schema in the SQL Server database. can i store the above class object to the database with out using SQL query for insert/update/delete but using XML. because i need reusablity. if i do it using sql i need to change my query every time when ever modification of class. can anyone help me please. Thanks in advance. krish Tag: Pros and Cons Tag: 63012
  - 10
    - SQL Server not exist or denide access Dear friends my problem is this: I have installed MSDE and when try to connect to it by this code: Try Dim conn As New SqlConnection("server=VSDOTNET;uid=sa;database=master") conn.Open() If (conn.State = ConnectionState.Open) Then MessageBox.Show("Connection opened successfully") End If conn.Close() Catch ex As SqlException MessageBox.Show(ex.Message) End Try ....an msgbox show this message:"SQL Server not Exist or Denide Access". Why ?? Tag: Pros and Cons Tag: 62997
  - 11
    - Stores Procedures with Informix How I can handle to the stores procedures in informix 9.30? Thanks Tag: Pros and Cons Tag: 62995
  - 12
    - Cannot fill Dataset Hi, I am still a beginner concerning ADO.net. When I am trying to read data from a Access-file into a dataset I always fail... :-( I am using the following code. The DB-Connection (Me.Con) is established and open. The SQL-Code is correct and the specified table exists. Dim DA As New OleDbDataAdapter() DA.SelectCommand = New OleDbCommand _ ("SELECT MID, From, To, Subject FROM gmx", Me.Con) DA.TableMappings.Add("Table", "gmx") Dim Tbl As DataTable Dim NR As DataRow Dim DS As DataSet DS = New DataSet("gmx") DA.Fill(DS) .... The error "An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in system.data.dll" occurs in at the DA.Fill(DS) Command. I can do what I want. I also tried just to fill a datatable, but I always get the same error. What am I doing wrong? Thanks, Sebastian Walters Tag: Pros and Cons Tag: 62990
  - 13
    - OleDbDataCommand problem I'm know the "old" implementation of ADO very well, and I am now trying to get used to ADO.NET. I've always preferred creating connection, commands and recordsets programmaticaly since every application I've built that needs data access allows for modifiable connection settings. This leads me to my question: When I create a OleDbConnection, OleDbCommand and OleDbDataReader to retrieve data from an Access database, everything works the way it should until I set the CommandText for the OleDbCommand object. It seems that if I try to order the results using the ORDER BY command an OleDbException is thrown with the following description: Unspecified error: E_FAIL(0x80004005) However, if I do not use and ORDER BY command, the exception is not thrown. Here's the code: public OleDbDataReader GetPopUps() { OleDbCommand cmd=new OleDbCommand(); OleDbDataReader dr; cmd.Connection=mcn; cmd.CommandType=CommandType.Text; cmd.CommandText="SELECT PUKey, Domain FROM PopUp ORDER BY Domain ASC"; dr = cmd.ExecuteReader(); cmd=null; return dr; } Any help would be greatly appreciated. Paul Tag: Pros and Cons Tag: 62989
  - 14
    - Can't find component or one of its dependencies?!? I have several COM+ objects (amongst others): BO.Dispatch, DAL.BaseDAL, Config, BF.Inventory, and DAL.Inventory Each object (except DAL.BaseDAL and Config) implements the IGateway interface (my creation; contains a single function, Gateway(String, String) As Object). Every object is registered in COM+ and the GAC. In this case, every object is in COM+ in a separate COM+ application, all as Server Applications running as the Interactive User. And I have the following sequence of events: TestApp.exe runs TestApp.exe calls a method on BO.Dispatch BO.Dispatch calls DAL.BaseDAL DAL.BaseDAL calls Config Config returns a connection string stored in the registry DAL.BaseDAL uses connection string to get a DataSet BO.Dispatch examines values in DataSet BO.Dispatch calls BF.Inventory BF.Inventory calls DAL.Inventory DAL.Inventory calls DAL.BaseDAL... What *should* happen is the DAL.BaseDAL calls Config for the connection string and gets another DataSet. However, I'm getting an error that DAL.Inventory can't create a DAL.BaseDAL object because it can't find it (full error is below). How can this be? It obviously *can* be found, since BO.Dispatch uses it just fine. All objects are compiled with references to the bin\[objectname].dll file they depend on, and the dependencies are set up so that, when I compile all the objects, DAL.BaseDAL is one of the first things to get compiled (after IGateway and Config). Specifically, here, both BO.Dispatch and DAL.Inventory are set to depend on BaseDAL. --Error follows-- {System.IO.FileNotFoundException} [System.IO.FileNotFoundException]: {System.IO.FileNotFoundException} HelpLink: Nothing InnerException: Nothing Message: "File or assembly name DAL.BaseDAL, or one of its dependencies, was not found." Source: "DAL.Inventory" StackTrace: " Server stack trace: at DAL.Inventory.SearchInventory(String Security, String Transaction) at DAL.Inventory.Gateway(String Security, String Transaction) at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(Met hodBase mb, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessa ge msg, Int32 methodPtr, Boolean fExecuteInContext) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at DAL.Inventory.Gateway(String Security, String Transaction) at BF.Inventory.PassThrough(String Security, String Transaction) at BF.Inventory.Gateway(String Security, String Transaction) at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(Met hodBase mb, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessa ge msg, Int32 methodPtr, Boolean fExecuteInContext) Exception rethrown at [1]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at IGateway.Gateway(String Security, String Transaction) at modDispatch.ExecuteTransaction(String ObjectName, String Security, String Transaction) at BO.Dispatch.Gateway(String Security, String Transaction) at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(Met hodBase mb, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessa ge msg, Int32 methodPtr, Boolean fExecuteInContext) Exception rethrown at [2]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at BO.Dispatch.Gateway(String Security, String Transaction) at TestApp.Form1.Button1_Click(Object sender, EventArgs e) in C:\WMS\TestApp\Form1.vb:line 111" TargetSite: {System.Reflection.RuntimeMethodInfo} Tag: Pros and Cons Tag: 62985
  - 15
    - Object reference not set to an instance of an object I am constantly receiving the "Object reference not set to an instance of an object" Exception when I try to set the autoincrement to true. I found the Knowledge Base Article 819346 which seems to address the error message, but how do I know that this is what is causing the problem..? If this is the route I must take, is the only fix for this is to upgrade to .Net 2003??? Here is the line of code I am receiving error on: Dim IdCol As String = "type_id" Dim ParentTable As String = "PgmTypes" 'Error occurs here Ds1.Tables(ParentTable).Columns(IdCol).AutoIncrement = True Ds1.Tables(ParentTable).Columns(IdCol).AutoIncrementSeed = -1 Ds1.Tables(ParentTable).Columns(IdCol).AutoIncrementStep = -1 Ds1.Tables(ParentTable).PrimaryKey = New Object() {Ds1.Tables(ParentTable).Columns(0)} sqlDataAdp.Fill(Ds1, ParentTable) uwGrid.DataSource = Ds1 uwGrid.DataMember = ParentTable 'Set the datakeyfield for the row.datakey property population uwGrid.Bands(0).DataKeyField = IdCol uwGrid.DataBind() Any help would be great, Thanks. Tag: Pros and Cons Tag: 62981
  - 16
    - Read This Look in this group threads there is an enourmous thread on just this in the last week or so Tag: Pros and Cons Tag: 62970
  - 17
    - try/catch question In building a web or windows based application, I'm not sure how best to set up my structured error handling. And any suggestions or known practice tips will be greatly apprecited. :) Specifically, in my classes that are called by a form (Web/Windows), do I try to be specific about the errors that are trapped or be more generic. Do I then be more specific on the forms? For example: Class public class DoSomethingHere public sub ASubRoutine try -- implementaion code here --- catch ex as exception throw ex end try end sub end class Windows form pub class frmMain inherits system.windows.forms.form private sub DoASubRoutine dim x as nw aSubRoutine try x.ASubroutine catch ex as sqlexception -- implemention code for a sqlexception here -- catch ex as system.arithmaticexception -- implement code for arithmatic exception here --- catch ex as exception -- implement generic exception code here -- end try end sub end class Any tips, advice, or pointers would be greately appreciated. Tag: Pros and Cons Tag: 62966
  - 18
    - Would like to learn asp.net, ado.net Hello. I am looking for some individual tutoring on ASP.Net and ADO.Net, in conjunction with reading/writing to an Access database. Ideally, I would like to get a "hello world" database up and running. I have learned a bit about each of these technologies through reading, although I am finding it rough going combining them to get a real-world project going. Is there anybody who'd be available for this sort of thing? I own Office 2000 and Visual Studio.Net Professional, as well as have a .Net web hosting account. I live in San Francisco, CA, and can pay (what I think is) a reasonable hourly fee. If anybody is interested, please email me at msofficeguyNOSPAM@yahoo.com. (remove the NOSPAM part) Thanks. Tag: Pros and Cons Tag: 62964
  - 19
    - DropdownList SelectedIndexChanged event I am using the SelectIndexChanged event for a dropdownList control. Currently, the only way the SelectIndexChange event is fired is after a user changes the selection within the dropdownlist AND clicks a command button. Does anyone know how to get this event to fire (or some other event) right after the user changes the selection w/i the dropdownList control? Tag: Pros and Cons Tag: 62961
  - 20
    - DataGrid question Does anyone know if you can disable the grid from allowing manual creation of new records, i want to only allow programitic creation and only allow editing of existinf records to take place in the grid. TIA Tag: Pros and Cons Tag: 62954
  - 21
    - problem with displaying new row Hello, My problem must be very simple to solve, but I havennt found the answer yet, so any help is appreciated. I have a form with bound controls, mostly textboxes, to an access database. When I fill the dataset the datatable which is used in the binding correctly populates the controls on the form. All navigation buttons work perfectly. The edit and delete button do their work without a problem. After a delete the label which displays current and total records by counting the rows in the table is decreased by one as it should. My only problem is after I add a new row. The row is added, but I can not navigate to it. The counter adds 1 record, so I know the add was successfull, but when I want to go to the last record it just doesnt do it. It stops at record 14/15. I use the me.databidings(dt).position = dt.rows.count - 1 to jump to the last record, which normally works, bt doesnt after I added a record. Finally, when I stop the application and restart the record the new record is added to the database and I can use it like any other record. Any ideas why I cant navigate to the new record after I created it? Thanks in advance. Tag: Pros and Cons Tag: 62944
  - 22
    - Earn $500 to $700 per Week Downloading FREE Software We know it sounds TOO good to BE true, but it?s REAL! Our International Technology firm will pay you hard cash each time FREE software is downloaded. Best of all you will only have to download ONE piece of software ONE time for FREE and you can be on your way to earning BIG! FIND OUT MORE BY VISITING http://JeromeMcCrea.PlugUsIn4Cash.com Tag: Pros and Cons Tag: 62943
  - 23
    - Login failed for user '(null)'. Reason: Not associated vs asp.net ASP.NET vs SQL Server¸ I have an ASP.NET Application In IIS I checked the Integrated Windows Authentication option In Web.Config the connection string include Integrated Security = SSPI and Impersonate=true in Web.Config When I start then Web Application I have this messge Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection. Could you help me PS My account have the permission to connect to SQl Server the security model is base on role security I have many users Tag: Pros and Cons Tag: 62936
  - 24
    - calculated column in datatable using parent's columns Can I use the parent table's columns in the Expression property of a DataColumn? Tag: Pros and Cons Tag: 62933
  - 25
    - Weird Timeout Expired error Hello all, Here is current snapshot of our environment: ASP.NET (C#) .Net Framework 1.0 SP2 MDAC 2.71 (SP1) Windows 2000 (Build 2195 SP3) SQL Server 2000 - 8.00.760 (SP3) We are using Microsoft SqlHelper from the Application Blocks and we currently have connection pooling = no Every now and then we get two types of errors: First Error: "System.Data.SqlClient.SqlException: General network error. Check your network documentation." This error tends to go away if we refresh the browser. Second Error: "System.Data.SqlClient.SqlException: Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding." What is interesting about this error is that the procedure being called takes 1 parameter (a state UID) and returns within 3 seconds. I was getting an exception immediately (no 3 second delay) if I passed a state returning couple of hundred records consisting of VARCHAR and INT values, but works fine if there are fewer or no return values. Once I executed that same procedure using Query Analyzer for the problem state, the application started to work fine. It is happening on various procedure calls every few hours. I have looked on Microsoft's newsgroups, google, and on MSDN but I cannot find anything that applied to us. Any input would be appreciated. Fadi Tag: Pros and Cons Tag: 62930
- Next
  - 1
    - enforcing FK constraints on datatables that are not in a DS Hi All, I've created two datatables dtCountries and dtCities in memory. I am able to create a FK constraint on dtCities without adding these datatables to a dataset. But unless I add them to a dataset I am not able to enforce the constraint. Is there any way to enforce FK constraint without adding them to a dataset? TIA Sankar Tag: Pros and Cons Tag: 62926
  - 2
    - Returning a cursor from a stored procedure How do I capture a resultset from a stored procedure with ado.net code? ALTER PROCEDURE dbo.sp_ins_contacts ( @FName nvarchar(50), @LName nvarchar(50), @Initials nvarchar(50), @IntakeDate smalldatetime, @SSN nchar(10), @Advisor nvarchar(50 ) AS SET NOCOUNT OFF; INSERT INTO tbl_Contacts(FName, LName, Initials, IntakeDate, SSN, Advisor) VALUES (@FName, @LName, @Initials, @IntakeDate, @SSN, @Advisor); SELECT ContactID, FName, LName, Initials, IntakeDate, SSN, Advisor FROM tbl_Contacts WHERE (ContactID = @@IDENTITY) Tag: Pros and Cons Tag: 62925
  - 3
    - Returning a cursor from a stored procedure How do I capture a resultset from a stored procedure with ado.net code? ALTER PROCEDURE dbo.sp_ins_contacts ( @FName nvarchar(50), @LName nvarchar(50), @Initials nvarchar(50), @IntakeDate smalldatetime, @SSN nchar(10), @Advisor nvarchar(50 ) AS SET NOCOUNT OFF; INSERT INTO tbl_Contacts(FName, LName, Initials, IntakeDate, SSN, Advisor) VALUES (@FName, @LName, @Initials, @IntakeDate, @SSN, @Advisor); SELECT ContactID, FName, LName, Initials, IntakeDate, SSN, Advisor FROM tbl_Contacts WHERE (ContactID = @@IDENTITY) Tag: Pros and Cons Tag: 62924
  - 4
    - DefaultViewManager In MSDN library, it says that when data binding if you bind to a DataTable, in fact you bind to its DefaultView, and if you bind to a DataSet, in fact you bind to its DefaultViewManager. It is true for DataTable. If I use the following binding: dataGrid1.DataSource = dataSet1.Employee; dataGrid1.DataMember = null; Everytime I change the filter, the DataGrid changes, too. dataSet1.Employee.DefaultView.RowFilter = "Name < 'H'"; However, if I use the following binding: dataGrid1.DataSource = dataSet1; dataGrid1.DataMember = "Employee"; When I change the filter, the DataGrid is not responding. dataSet1.DefaultViewManager.DataViewSettings ["Employee"].RowFilter = "Name < 'H'"; I saw some programmers work around the problem by constructing a new DataViewManager. I wonder why Microsoft doesn't admit there is a bug, or say this behavior is by design. JT Tag: Pros and Cons Tag: 62921
  - 5
    - How do I query a DataSet to get unique IDs? Hi, I have a DataSet that contains data pairs for computers and IP addresses. Because in some cases a computer has multiple IP addresses, the HardwareID is in the DataSet multiple times. I want to create a DataView that has only the unique HardwareID's in the DataSet. How do I query my DataSet to get these HardwareIDs? Someone suggested DISTINCT but I don't know how to use DISTINCT against a DataSet to create a DataView. Could someone help me with this? Thanks, Sam Tag: Pros and Cons Tag: 62912
  - 6
    - String Error in ADo.Net Dataset code I am developing an database appliction using SQL 7 with a Visual Basic Front End using ADO.Net. When generating a dataset from the DataAdapter all the Textboxes and ComboBoxes contain the following error "'Convert' is not a member of 'String'" in the autogenerated DataSet Name.vb file. The error occurs in the following type Subs: Public Sub SetinvestigationNull() Me(Me.tablerer.investigationColumn) = System.Convert.DBNull End Sub If I comment out the "Me(Me.tablerer.investigationColumn) = System.Convert.DBNull" portion of the Sub the code compiles and runs correctly. Since I have many textboxes in the VB form, about 40, that is a lot commenting to get the application to run correctly. Is were a way to get the code to compile? Thanks Joe Tag: Pros and Cons Tag: 62909
  - 7
    - data file to database Hello I have a data file like this : 01 "" "09:04" "PLMDX " 3.20 0.35 1.74 0.23 2.49 0.17 1.37 0.18 03 02 "" "09:05" "PLMDX " 3.70 0.18 1.93 0.14 2.75 0.19 1.05 0.01 03 03... 04... ..... and i want to read each number and fileds and save it to variables to save it in to the database . with stream reader and file rader i can only read all of it as a single string , is that possible to do it with regular expression ? i don't know how . any idea ... help please Tag: Pros and Cons Tag: 62891
  - 8
    - What happens when you delete a DataRow ? I know that the state is changed to deleted, but what else happens ?, does the table make a new version of itself each time or the row ? The reason i'm asking is because I'm have a tough time understanding how making changes to more than one row ( but not more than one change per row ) and then trying to update the dataadapter can cause a concurrency error. There are no other users involved any assistance is appreciated in understanding this . . . Regards - Terry Tag: Pros and Cons Tag: 62889
  - 9
    - Oracle or SQLServer - .NET or J2EE? Hello, I am doing a very large web based database project. Over the period of 5 years, "more than 100, 000 Books" will be stored in a Database along with a LARGE amount of book attributes majorly consists of very large amount of people reviews about a book. We then need to analyze or generate reports from that large volume of STATIC data in Infinite number of ways. My questions are: Q1. Just to get general sence, Which suits the best Oracle or SQL Server for this project and Why? Keeping scalibility, volume of data, etc. in mind? Q2. Which development platform best suits best for this kind of project .NET or J2EE and Why. Q3. We have to analyze or generate reports from that STATIC data in Infinite number of ways, Which analysis technology should be used and Why? Thanks, Rafey. Tag: Pros and Cons Tag: 62884
  - 10
    - Connection Pooling with Microsoft Access? Hello, Is it possible to connection pool with Microsoft Access? I am coding in VB.NET and my application is giving me errors because the connection is still open and fetching records. Thanks! Tag: Pros and Cons Tag: 62883
  - 11
    - Unexpected error in webform any body seen this error? No error information available: E_UNEXPECTED(0x8000FFFF). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.OleDb.OleDbException: No error information available: E_UNEXPECTED(0x8000FFFF). It's random occuring mostly when i update the webserver with a fresh dll, but not every time. Only way around that is to re-start the application pool or re-start iis. My hunch at this time is that this is occuring because oledb and odbc providers are hosted in the same page. That's a wild guess though, not based on anything concrete. tia Tag: Pros and Cons Tag: 62856
  - 12
    - Cannot update Access database records I have code that inserts, updates, and deletes records from an Access 2002 table using OleDbCommand and OleDbConnections. Everything works great until I place the Access database on the network and more than one person launches the application. Everyone can still insert and delete but not update (using the custom app). Any ideas? Tag: Pros and Cons Tag: 62842
  - 13
    - [ANN] Innovation to ADO.NET - Object Access Services for .NET Innovation to ADO.NET - Object Access Services for .NET New Software Matisse Software Inc. provides its native ADO.NET Data provider for Matisse 6.0, the Database for .NET. Matisse Software has pushed the envelope of Microsoft ADO.NET architecture and extended it into a powerful Object Access Services component for .NET. Unlike the standard ADO.NET data provider, which returns data in a table format to integrate seamlessly with relational products, Matisse has extended the ADO.NET architecture to return data in an object format. http://www.matisse.com/ Tag: Pros and Cons Tag: 62836
  - 14
    - Schema problem with Strongly Typed dataset I have a strongly typed dataset whose schema looks as such: <?xml version="1.0" encoding="utf-8" ?> <xs:schema id="Dataset1" targetNamespace="http://tempuri.org/Dataset1.xsd" elementFormDefault="qualified" attributeFormDefault="qualified" xmlns="http://tempuri.org/Dataset1.xsd" xmlns:mstns="http://tempuri.org/Dataset1.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="Dataset1" msdata:IsDataSet="true"> <xs:complexType> <xs:choice maxOccurs="unbounded"> <xs:element name="cc"> <xs:complexType> <xs:sequence> <xs:element name="usr" minOccurs="0" maxOccurs="unbounded"> <xs:complexType> <xs:sequence> <xs:element name="distributionList" nillable="true" minOccurs="0" maxOccurs="unbounded"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string" /> </xs:simpleContent> </xs:complexType> </xs:element> </xs:sequence> <xs:attribute name="nam" type="xs:string" form="unqualified" /> <xs:attribute name="uid" type="xs:string" form="unqualified" /> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema> I have a test function in a windows form in which I try to fill the dataset up with xml. My function looks as such: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim ds As New Dataset1 Dim xreader As XmlReader Try Dim stream As New System.IO.StringReader("<cc>" & _ "<usr uid=""123"" nam=""Test User"">" & _ "<distributionList>testing</distributionList>" & _ "</usr>" & _ "</cc>") xreader = New XmlTextReader(stream) ' I am crashing here ds.ReadXml(xreader, XmlReadMode.InferSchema) MsgBox(ds.GetXml) Catch ex As Exception MsgBox(ex.Message) End Try End Sub My believe my problem lies in the schema. If I specify multiple or zero distributionList nodes the xml is read into the dataset correctly. If I specify just one distributionList node I get a "Specified cast is not valid". Am I missing something in the schema? Thanks, Collin Tag: Pros and Cons Tag: 62835
  - 15
    - Proposed method implementation in a new generic data access component I've mentioned in other posts that I am creating a generic ADO.NET project. Version 1 is already done actually (see my signature, and read synopsis in docs) I am making alot of additions in version 2. One being the addition of a bunch of classes that form a "Gen" provider... (GenConnection, GenDataAdapter, etc...). In the constructor of each data object I'm adding an additional parameter specifying the "DbContext". For example the standard IDbCommand constructor... public IDbCommand() //creates a standard Command, must set properties separately In my GenCommand as proposed... /// <summary> /// This constructor will use the connection of the /// DbContext if it has a ConnectionString assigned. /// </summary> /// <param name="ctx"></param> public GenCommand(DbContext ctx) { _ctx = ctx; _cmd = _ctx.DbTemplate.Command(); if (_ctx.ConnectionString.Length > 0) { _cmd.Connection = _ctx.Connection; } } Do you think it is a bad idea to imply the Connection from the context? I require the context to be able to dynamically load the appropriate underlying provider (Sql, OleDb, ODbc, etc...). But should I also use it to imply the connection. If the user desired they could overide it and specifiy a different connection. However, for those lazy people, the context gives enough info to specify the connection. It behaves different than all the other providers, which is why I'm wondering if it is a bad idea? Any advice? Which would you prefer as a user? -- Michael Lang, MCSD See my .NET open source projects http://sourceforge.net/projects/dbobjecter (code generator) http://sourceforge.net/projects/genadonet ("generic" ADO.NET) Tag: Pros and Cons Tag: 62830
  - 16
    - how can I get the path for the error ORA-01458 it is told on the microsoft web site that to resolve this=20 problem i must contact "the microsoft support service"=20 and they will send me the patch. THERE IS TONS OF MICROSOFT SUPPORT SERVICE... which one=20 must i contact and how much it will cost... I leave in qu=E9bec - canada (i speak french) thanks Tag: Pros and Cons Tag: 62827
  - 17
    - Why is this login failing? I am using VS in conjunction with SQL Server 2000. I am trying to create a new SQLConnection but am getting an error message of "Login failed. Not associated with a trusted SQL Server Connection" I drag a SQLConnection to my components tray. In the Connection String property I say New connection. I give the server name (which is the name of my computer) and put the radio on specific name and password. I enter a user name of sa and a password of xxx. I click on the field "Select the database on the server" and get the above mentioned error, followed by "Login failed, Catalog info can not be retrieved". In the past I have solved this problem by going into SQL Server and in the Server, Properties, Security tab changing the authenication to SQL Server and Windows. My notes indicate that in the past when I've had this problem it was because the authentication was not set to mixed. However this does not seem to fix the problem in this case. Does anyone have any idea what's going on? Tag: Pros and Cons Tag: 62826
  - 18
    - Record Locking? How would I go about locking records using ADO.Net? It seems that everything in ADO.Net is based upon opening a connection, retrieving data, and closing the connection. To keep the records locked, is it as simple as leaving the database connection open? ~Thanks Tag: Pros and Cons Tag: 62817
  - 19
    - What is the best way to delete multiple rows Grid, DataAdapter, Access Source What is the best way to delete multiple rows bound to a datagrid without getting a concurrency exception. TIA Tag: Pros and Cons Tag: 62816
  - 20
    - Connection String with Access Workgroup Info (mdw) I've searched through several forums without finding a definitive answer to this question: What is the proper syntax for a connection string that is connecting to an Access 97 db with workgroup security applied? I tried the following. I don't get an error, but it also displays NO results: Public Shared ReadOnly OleDbConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=DBQ=c:\CORmandOTweb\NewSecure CORMandatoryOTList.mdb SystemDB=c:\inetpub\wwwroot\aspdotnet\cormandot\db\corrections.mdw;UID=usern ame;PWD=anything" Also tried: Dim cnn As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=false;Data Source=" & System.Web.HttpContext.Current.Server.MapPath("/CORmandOTweb/NewSecure CORMandtoryOTList.mdb") & "; Jet OLEDB:System Database=c:\inetpub\wwwroot\aspdotnet\cormandot\db\corrections.mdw;UserID=us ername;Password=anything") All help will be greatly appreciated! Lynnette Tag: Pros and Cons Tag: 62802
  - 21
    - Concurrecy Error, anyone see what I'm doing wrong here ? This code takes the Person index drom the datagrid dgPeople and uses it to delete all the records from the dgEvents grid and underlying records. It works but i do get that concurrency message Case "Delete" Try 'open connection con.Open() 'Setup the Delete Command for events for this person DeleteCmd.CommandText = "DELETE * FROM [Events] WHERE PersonIndex = ?" DeleteCmd.Connection = con DeleteCmd.CommandType = CommandType.Text DeleteCmd.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_PersonIndex", System.Data.OleDb.OleDbType.Integer, 0, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "PersonIndex", System.Data.DataRowVersion.Original, Nothing)) Dim r As DataRow PersonIndex = CType(dgPeople.Item(dgPeople.CurrentRowIndex, 0), Int32) For Each r In tableEvents.Rows If PersonIndex = CType(r.Item(0), Int32) Then r.Delete() End If Next daEvents.DeleteCommand = DeleteCmd daEvents.Update(tableEvents) Catch ex As OleDbException MessageBox.Show(ex.Message) Finally con.Close() End Try Tag: Pros and Cons Tag: 62788
  - 22
    - Installation of VB.NET Program Let's say now that I have my program finished. How do I go about writing a setup program that would install the required directories, and place my files where they need to be? For starters, I have my exe file, and two jpg files that I want to bundle in an install program that will just create a folder on the desktop, and then create those files automatically. How could I do that? Also, what's the difference between Build Solution, Rebuild Solution, Build ProjectName, Rebuild ProjectName? Thanks Jordan Tag: Pros and Cons Tag: 62787
  - 23
    - ADO.NET xxxConnection best practice hello In my project i have classes whoes read,update , insert database for exemple in one method , i do 20 request which is best the practice ? a) open and close ADO.NET connection for each requests (using pooling connection but slower cause of .open() method ?) or b) open one connection for method , excute requests , close connection ( the pooling connection is use for the project and calls methods but not in each methods ) rq: my question is NOT for Execute multi request on one command , and NOT for using stored procedure thanks Tag: Pros and Cons Tag: 62783
  - 24
    - many repeatable operations Hi I have in my project (C#) many operation such as add, update, remove record from table. How to automate this. I don't wan to use grid. Are some code generators or something else to get this. The best for me is dialog with fields to fill in and verification of filled fields. Thanks Konrad Tag: Pros and Cons Tag: 62771
  - 25
    - Extending Typed "DataTables" I am facing the following problem in my applications and would like suggestions from you guys. My database schema has changed many times over the years and keeps chaging frequently according to specific client needs. My business layer (webservices) returns datasets to the thick client. The problem is that as the database changes so often, more than 800 datasets will have to be changed everytime. The solution suggested was as follows: a) Create 1 DataTable for each TABLE in the database. b) Create own DataSet for each visible screen or processing function by addind DataTables to this DataSet. c) Add Ref Contraints manually to this custom DataSet. This way, if the database changes, only one single DataTable class (schema) in the application will have to be changed. Now my problem is that i want to use Typed Datasets and Typed DataTables. What would be the best solution for this scenario. As mentioned on MSDN, DataTables can be instantiated independent of DataSets. In this case, the schema for the DataTable and the constraints are added manually in the code. But I could not find anything about extending Typed DataTables and using them independent of the DataSet. There is a powertoy by Shawn Wildermuth that helps you extend Typed DataSets, but i couldn't extrapolate his ideas to fit my requirements. Any ideas what the best thing for me would be ? Thanks, Nishith Tag: Pros and Cons Tag: 62769

I am looking for some pros and cons between developing a custom DAL wrapper
that would allow the developer to send the Stored Procedure name and some
parameters and just writing a DAL that is application specific such as
having a Products class and then using data adapters and such to return
application specific data. Currently I am using the first solution but I
find that sometimes there are things that would work better if I used the
application specific DAL such as having an array of items that need to be
added to the database as a single record for each item in the array but need
to have the current records removed before the new ones are added.

Stanley

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