ObjectDataSource Update Issue- DataObjectTypeName object is null

sreeni2219

New member
Joined
Jul 30, 2009
Messages
1
Programming Experience
5-10
am using ObjectDataSource and created UserDetails class and UserDB class.UserDetails calss has two constructors. My select method is working fine and is binding the values. After modifications if i click on Save button i am calling odsUsers.update() method. Whenever i goto debug mode, it is calling UpdateUser method of User class. Before that it went to userdetails default constructor (Public Sub New() End Sub ). I have noticed that
.Public Sub UpdateUser(ByVal user As UserDetails)
user object is null and all the values are either nothing or Zero. What am i missing here? Why my object is null instead having new values.


SAMPLE CODE:
Code:
Public Class UserDetails
        Private m_userID As Integer
        Private m_firstName As String
        Private m_lastName As String       
 
        Public Property UserID() As Integer
            Get
                Return m_userID
            End Get
            Set(ByVal value As Integer)
                m_userID = value
            End Set
        End Property
        Public Property FirstName() As String
            Get
                Return m_firstName
            End Get
            Set(ByVal value As String)
                m_firstName = value
            End Set
        End Property
        Public Property LastName() As String
            Get
                Return m_lastName
            End Get
            Set(ByVal value As String)
                m_lastName = value
            End Set
        End Property
 
 
        Public Sub New(ByVal UserID As Integer, ByVal firstName As String, ByVal lastName As String)
            Me.m_userID = UserID
            Me.m_firstName = firstName
            Me.m_lastName = lastName
        End Sub
 
        Public Sub New()
        End Sub
 
    End Class
 
 
 
 <DataObject()> _
    Public Class UserDB
        Private connectionString As String
       
 
        Public Sub New()
            ' Get connection string from web.config. 
            connectionString = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        End Sub
        Public Sub New(ByVal connectionString As String)
            Me.connectionString = connectionString
        End Sub
 
        <DataObjectMethod(DataObjectMethodType.Insert, True)> _
        Public Function InsertUser(ByVal user As UserDetails) As Integer
 
 
            Dim con As New OracleConnection(connectionString)
            Dim insUser As String
            
            insUser = "INSERT INTO USERS " & _
                                              "  (ID, FIRST_NAME, LAST_NAME)  " & _
                                              "  Values(USERS_SEQ.nextval,@FIRST_NAME, @LAST_NAME) "
 
            Dim cmd As New OracleCommand(insUser, con)
            cmd.CommandType = CommandType.Text
            cmd.Parameters.Add(New OracleParameter("@FIRST_NAME", user.FirstName))
            cmd.Parameters.Add(New OracleParameter("@LAST_NAME", user.FirstName))
         
 
            Try
                con.Open()
                cmd.ExecuteNonQuery()
 
            Catch err As OracleException
                ' Replace the error with something less specific. 
                ' You could also log the error now. 
                Throw New ApplicationException("Data error.")
            Finally
                con.Close()
            End Try
        End Function
 
        <DataObjectMethod(DataObjectMethodType.Update, True)> _
        Public Sub UpdateUser(ByVal user As UserDetails)
            Dim con As New OracleConnection(connectionString)
            Dim insUser As String
            
            insUser = "UPDATE LAP_USERS SET FIRST_NAME=@FIRST_NAME, LAST_NAME=@LAST_NAME  " & _
                                              "   where ID=@UserID "
 
            Dim cmd As New OracleCommand(insUser, con)
            cmd.CommandType = CommandType.Text
            cmd.Parameters.Add(New OracleParameter("@UserID", user.UserID))
            cmd.Parameters.Add(New OracleParameter("@FIRST_NAME", user.FirstName))
            cmd.Parameters.Add(New OracleParameter("@LAST_NAME", user.FirstName))
           
            Try
                con.Open()
                cmd.ExecuteNonQuery()
 
            Catch err As OracleException
                ' Replace the error with something less specific. 
                ' You could also log the error now. 
                Throw New ApplicationException("Data error.")
            Finally
                con.Close()
            End Try
 
        End Sub
 
      
        <DataObjectMethod(DataObjectMethodType.[Select], False)> _
        Public Function GetUsers(ByVal userID As Integer) As UserDetails
 
            Dim con As New OracleConnection(connectionString)
            Dim GetUser As String
            
            GetUser = "Select ID,FIRST_NAME ,LAST_NAME from USERS ID=" & userID
            Dim cmd As New OracleCommand(GetUser, con)
            cmd.CommandType = CommandType.Text
 
            Try
                con.Open()
                Dim reader As OracleDataReader = cmd.ExecuteReader(CommandBehavior.SingleRow)
 
                ' Get the first row. 
                reader.Read()
                Dim user As New UserDetails(CInt(reader("ID")), DirectCast(reader("FIRST_NAME"), String), DirectCast(reader("LAST_NAME"), String)
                reader.Close()
                Return user
            Catch err As Exception
                ' Replace the error with something less specific. 
                ' You could also log the error now. 
                Throw New ApplicationException("Data error.")
            Finally
                con.Close()
            End Try
        End Function
 
        <DataObjectMethod(DataObjectMethodType.[Select], True)> _
        Public Function GetUsers() As List(Of UserDetails)
            Dim con As New OracleConnection(connectionString)
            Dim GetAllUsers As String
            
            GetAllUsers = "Select ID,FIRST_NAME ,LAST_NAME from USERS "
 
            Dim cmd As New OracleCommand(GetAllUsers, con)
            cmd.CommandType = CommandType.Text
 
            ' Create a collection for all the employee records. 
            Dim users As New List(Of UserDetails)()
 
            Try
                con.Open()
                Dim reader As OracleDataReader = cmd.ExecuteReader()
 
                While reader.Read()
                    Dim user As New UserDetails(CInt(reader("ID")), DirectCast(reader("FIRST_NAME"), String), DirectCast(reader("LAST_NAME"), String))
                    users.Add(user)
                End While
                reader.Close()
 
                Return users
            Catch err As OracleException
                ' Replace the error with something less specific. 
                ' You could also log the error now. 
                Throw New ApplicationException("Data error.")
            Finally
                con.Close()
            End Try
        End Function
    End Class
ASPX CODE:
HTML:
<asp:ObjectDataSource ID="odsUsers" runat="server"
        DataObjectTypeName="DatabaseComponent.DatabaseComponent.UserDetails" 
        InsertMethod="InsertUser"  
        UpdateMethod = "UpdateUser"
         SelectMethod="GetUsers" TypeName="DatabaseComponent.DatabaseComponent.UserDB" >
         <SelectParameters>
              <asp:Parameter Name="userID" Type="Int32" />
         </SelectParameters>
            
    </asp:ObjectDataSource>
 
 
 
 <table width="100%" border="0">
 
    <asp:FormView ID="frm" runat="server"  DataSourceID = "odsUsers" DefaultMode="ReadOnly" >
                    <EditItemTemplate>
                    <tr>
                        <td>    
                        <table border="0" id="UserData" width="100%">
                        <tr>
                        
                            <td><asp:Label ID="lblFirstName" Font-Bold="true" ForeColor= "red" Text="First Name: *" runat="server"></asp:Label>
                                </td>   
                            <td> <asp:textbox ID="txtFirstName"  runat="server" width="200px" text='<%# Bind("FirstName") %>'></asp:textbox>
                                                        
                            
                            </td>                     
                            <td > <asp:Label ID="lblLastName" Font-Bold="true" ForeColor= "red" Text="Last Name: *" runat="server"></asp:Label>
                            </td>
                            <td>
                            <asp:textbox ID="txtLastName"  runat="server" width="200px" text='<%# Bind("LastName") %>'></asp:textbox>
                                
                            </td>
                        </tr>
                    
                        
                      
                        <tr>
                            <td colspan="2" align="center"><br /><br />
                                <asp:Button ID="btnSave" runat="server" CausesValidation="true" Text="Save" 
                                    onclick="btnSave_Click"></asp:Button>
                            </td>
                       
                        </tr>
                         <tr>
                                             </table>
                        
                        </td>
                        
                    </tr>
                  
                </table>
                </EditItemTemplate>
          </asp:FormView>
Code:
Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        
            odsUsers.update()
       
    End Sub
 
Last edited by a moderator:
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