How To Find Matching Values In A Generic List

May 25, 2010

I have anywhere from 5 to 10 generic list in an ASP.NET VB.NET web app. I would like to write a method to pass them all into, and return only the elements they all have in common.

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I have this ASP.NET code:


My DAL code:

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< asp:DropDownList ID="ddlStatus" runat="server" DataSourceID="objDSStatus"
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< /asp:DropDownList>
< asp:ObjectDataSource ID="objDSStatus" runat="server" TypeName="DA"></asp:ObjectDataSource>
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I'm a starting C# programmer and I'm experiencing the following problem.I've created a dataset in Visual Studio With a table for persons making use of two table adapters, one for selecting all persons and one for selecting one person at a time filtered by the personID (Guid). This is a seperate project of my solution. After that I created a new project for the Business Logic Layer

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ADO.NET :: Couldn't Find Non Generic Method 'DeleteProduct'

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<asp:GridView ID="ProductsGrid" runat="server" AutoGenerateColumns="False" DataKeyNames="ID,UserId"
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<asp:CommandField ShowDeleteButton="True" ValidationGroup="InsertValidationControls" />
<asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID"
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<asp:BoundField DataField="UserId" HeaderText="UserId" ReadOnly="True"
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<asp:ObjectDataSource ID="ProductsOptimisticConcurrencyDataSource" runat="server"
SelectMethod="GetZaposleniBy" TypeName="zaposleni"
<asp:Parameter Name="ID" Type="Int32" />
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int rowsAffected = Adapter.Delete(ID,UserId);
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The problem is when I use Guid UserId = Guid.NewGuid ();.

In Table I UserId type: unique Therefore it does not work. If I use the UserId type: int working.

ObjectDataSource 'ProductsOptimisticConcurrencyDataSource' could not find a non-generic method 'DeleteProduct' that has parameters: ID, UserId.

Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: ObjectDataSource 'ProductsOptimisticConcurrencyDataSource' could not find a non-generic method 'DeleteProduct' that has parameters: ID, UserId.

Source Error:

Stack Trace:

[InvalidOperationException: ObjectDataSource 'ProductsOptimisticConcurrencyDataSource' could not find a non-generic method 'DeleteProduct' that has parameters: ID, UserId.]
System.Web.UI.WebControls.ObjectDataSourceView.GetResolvedMethodData(Type type, String methodName, IDictionary allParameters, DataSourceOperation operation) +1119426
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteDelete(IDictionary keys, IDictionary oldValues) +504
System.Web.UI.DataSourceView.Delete(IDictionary keys, IDictionary oldValues, DataSourceViewOperationCallback callback) +89
System.Web.UI.WebControls.GridView.HandleDelete(GridViewRow row, Int32 rowIndex) +714
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +869
System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) +207
System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +175
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565a

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I try to update the detailview control. got this error messsage.

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here's my edit function


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public class ImageThing
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Below is the code:

The *.aspx file:
<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true"
CodeFile="Maintain_Virtual_Users.aspx.cs" Inherits="Maintain_Virtual_Users" Title="Maintain Accounts" StylesheetTheme="Master" %>
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Maintain Virtual Users</h2>
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<asp:BoundField DataField="name" HeaderText="name" SortExpression="name" />
<asp:BoundField DataField="notes" HeaderText="notes" SortExpression="notes" />
<asp:CheckBoxField DataField="active" HeaderText="active"
SortExpression="active" />
<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataKeyNames="ident"
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DefaultMode="Insert" AutoGenerateInsertButton="False">
<asp:BoundField DataField="ident" HeaderText="ident" ControlStyle-Width="250"
SortExpression="ident" ReadOnly="True" >
<asp:BoundField DataField="name" HeaderText="name" SortExpression="name" />
<asp:BoundField DataField="notes" HeaderText="notes" SortExpression="notes" />
<asp:CheckBoxField DataField="active" HeaderText="active"
SortExpression="active" />
<asp:CommandField ShowInsertButton="True" />
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
DeleteMethod="DeleteVirtual" InsertMethod="AddVirtual"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetVirtual"
TypeName="VirtualPeopleBLL" UpdateMethod="UpdateVirtual">
<asp:Parameter Name="ident" Type="Int32" />
<asp:Parameter Name="ident" Type="Int32" />
<asp:Parameter Name="name" Type="String" />
<asp:Parameter Name="notes" Type="String" />
<asp:Parameter Name="active" Type="Boolean" />
<asp:Parameter Name="ident" Type="Int32" />
<asp:Parameter Name="name" Type="String" />
<asp:Parameter Name="notes" Type="String" />
<asp:Parameter Name="active" Type="Boolean" />
the .BLL:
using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using dsVirtualPeopleTableAdapters;
public class VirtualPeopleBLL
private VirtualPeopleTableAdapter _virtualPeopleAdapter = null;
protected VirtualPeopleTableAdapter Adapter
if (_virtualPeopleAdapter == null)
_virtualPeopleAdapter = new VirtualPeopleTableAdapter();
return _virtualPeopleAdapter;

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