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04.18.2008 at 03:33AM PDT, ID: 23333724
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5.2

There is no row at position 0 -> DataSet and Objectdatasource ( Need help to fix problem in Code)

Asked by fosiul01 in .NET, Programming for ASP.NET, Visual Studio

Tags:

HI,  i have Asked  this question here before : http://www.experts-exchange.com/Microsoft/Development/.NET/Visual_Studio_.NET_2005/Q_23333489.html l, but The expert said to open again .  hence, i opened a new questions for your help.

Problem is : i am following this sites for this tutorial http://msconline.maconstate.edu/tutorials/ASPNET20/default.htm.
i did what Auther said, but When i am running the programm and trying to delete record , its saying " There is no row at position 0 ".
In my table there are more then 10 record, but the Code is not  getting any record in Dataset
I have attached the Code and picture of my problem as well.

Note : What step we took for trouble shooting previously, please have a look to my prevous question-http://www.experts-exchange.com/Microsoft/Development/.NET/Visual_Studio_.NET_2005/Q_23333489.html
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***************************************DBclass.vb*******************************
Imports Microsoft.VisualBasic
Imports System.Data.OleDb
Imports System.Data
 
Public Class DSClass
    Function Select_BookIDs()
        Dim DBConnection As OleDbConnection
        Dim DBCommand As OleDbCommand
        Dim DBReader As OleDbDataReader
        Dim SQLString As String
        DBConnection = New OleDbConnection( _
          "Provider=Microsoft.Jet.OLEDB.4.0;" & _
          "Data Source=c:\BooksDB.mdb")
        DBConnection.Open()
        SQLString = "SELECT DISTINCT BookID FROM Books ORDER BY BookID"
        DBCommand = New OleDbCommand(SQLString, DBConnection)
        DBReader = DBCommand.ExecuteReader()
        Return DBReader
        DBReader.Close()
        DBConnection.Close()
    End Function
 
    Function Select_Book(ByVal BookID As String)
        Dim DBConnection As OleDbConnection
        Dim DBAdapter As OleDbDataAdapter
        Dim DBDataSet As DataSet
        Dim SQLString As String
        DBConnection = New OleDbConnection( _
          "Provider=Microsoft.Jet.OLEDB.4.0;" & _
          "Data Source=c:\BooksDB.mdb")
        SQLString = "SELECT * FROM Books WHERE BookID = '" & BookID & "'"
        DBAdapter = New OleDbDataAdapter(SQLString, DBConnection)
        DBDataSet = New DataSet
        DBAdapter.Fill(DBDataSet)
        Return DBDataSet
    End Function
 
    Function Delete_Book(ByVal BookID As String)
        Dim DBConnection As OleDbConnection
        Dim DBAdapter As OleDbDataAdapter
        Dim DBDataSet As DataSet
        Dim SQLString As String
        Dim DBCommandBuilder As OleDbCommandBuilder
        DBConnection = New OleDbConnection( _
          "Provider=Microsoft.Jet.OLEDB.4.0;" & _
          "Data Source=c:\BooksDB.mdb")
        SQLString = "SELECT * FROM Books WHERE BookID = '" & BookID & "'"
        DBAdapter = New OleDbDataAdapter(SQLString, DBConnection)
        DBDataSet = New DataSet
        DBAdapter.Fill(DBDataSet)
        DBDataSet.Tables(0).Rows(0).Delete()
        DBCommandBuilder = New OleDbCommandBuilder(DBAdapter)
        DBAdapter.Update(DBDataSet)
 
    End Function
End Class
 
**************************************** default.aspx**************
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
   <asp:ObjectDataSource id="BookIDSource" Runat="Server"
  TypeName="DSClass"
  SelectMethod="Select_BookIDs"/>
 
<asp:DropDownList id="DropList" DataSourceID="BookIDSource" Runat="Server"
  DataTextField="BookID"
  DataValueField="BookID"
  AutoPostBack="True"/>
  
  <asp:ObjectDataSource id="BookSource" Runat="Server"
  TypeName="DSClass"
  SelectMethod="Select_Book"
  DeleteMethod="Delete_Book">
  <SelectParameters>
      <asp:ControlParameter ControlID="DropList" Name="BookID" PropertyName="SelectedValue"
          Type="String" />
  </SelectParameters>
      <DeleteParameters>
          <asp:Parameter Name="BookID" Type="String" />
      </DeleteParameters>
</asp:ObjectDataSource>
 
<asp:DetailsView id="BookView" DataSourceID="BookSource" Runat="Server"
  AutoGenerateEditButton="True"
  AutoGenerateDeleteButton="True"
  AutoGenerateInsertButton="True"
    RowStyle-VerticalAlign="Top"
    RowStyle-Font-Size="10pt">
    <RowStyle Font-Size="10pt" VerticalAlign="Top" />
</asp:DetailsView>
    </div>
    </form>
</body>
</html>
Attachments:
 
Norow.GIF (64 KB) (File Type Details) 
Norow
Norow
 
[+][-]04.18.2008 at 06:08AM PDT, ID: 21385378

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About this solution

Zones: .NET, Programming for ASP.NET, Visual Studio
Tags: vb.net 2005(Web programming)
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Solution Provided By: fosiul01
Participating Experts: 1
Solution Grade: A
 
 
 
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