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C# ListBox Management Adding Removing Updating Databound Items ASP .Net

The lambda one-liner indicated in the snippet below essentially nests at least two “for/foreach” loops. See my related article for full source.

This code snippet is used to populate a drop down list of all factories containing unregistered robots where are not already marked in the list to be decommissioned.

Upon selecting a factory containing unregistered robots, another listbox is populated with the robots so they can be selected from which moves them into the decommissioned list.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;

public partial class DecommissionRobots : System.Web.UI.UserControl
{
public event EventHandler SendToDecommission;

    public void Update()
    {
        upnlContainer.Update();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            LoadRegions();
            txtExpDate_CalendarExtender.SelectedDate = DateTime.UtcNow.AddMonths(6);
        }
    }

    protected void LoadRegions()
    {
        using (AndroneticsDataContext db = new TigrentLearningDataContext(
        ConfigurationManager.ConnectionStrings["AndroneticsConnection1"].ConnectionString)) {
        ddlRegions.DataSource = db.UP_GET_REGIONS();
        ddlRegions.DataTextField = "REGION";
        ddlRegions.DataValueField = "REGION_ID";
        ddlRegions.DataBind();

        ListItem li = new ListItem("", "");
        ddlRegions.Items.Insert(0, li);
}
    }

    protected void ClearLists()
    {
        lstUnselectedRobots.Items.Clear();
//you may want to clear other lists in this manner in your app as well
    }

protected void LoadFactories()
    {
        ClearLists();

        if (ddlSegment.SelectedIndex > 0)
        {
            using (AndroneticsDataContext db = new AndroneticsDataContext(
        ConfigurationManager.ConnectionStrings["AndroneticsConnection1"].ConnectionString))
            {
                List<UP_GET_FactoriesResult> allFactories = db.UP_GET_Factories(Convert.ToInt32(ddlRegion.SelectedValue), null).ToList();

                ////this would be approximately how you would approach traditionally
                //foreach (UP_GET_FactoriesResult r in allFactories)
                //{
                //    if (GetUnregisteredRobots(r.FACTORY_ID).Count != 0)
                //    {
                //        //etc, would need another loop here
                //    }
                //}

                //now for the lambda way
                var Factories = allFactories.Where(
                    r => GetUnregisteredRobots(r.FACTORY_ID).Where(
                        ra => !lstDecommissionRobots.Items.Contains(new ListItem(ra.ROBOT_NAME,ra.ROBOT_ID.ToString()))).Count() != 0);

                ddlFactories.DataSource = Factories;
                ddlFactories.DataTextField = "FACOTRY_TITLE";
                ddlFactories.DataValueField = "FACTORY_ID";
                ddlFactories.DataBind();

                ListItem li = new ListItem("", "");
                ddlFactories.Items.Insert(0, li);
            }
        }
    }

    private List<UP_LOAD_COURSE_RobotsResult> GetUnregisteredRobots(int courseid)
    {
        using (AndroneticsDataContext db = new AndroneticsDataContext(
        ConfigurationManager.ConnectionStrings["AndroneticsConnection1"].ConnectionString))
        {
            List<UP_LOAD_COURSE_RobotsResult> allRobots = db.UP_LOAD_COURSE_Robots(courseid).ToList();

            int userID = int.Parse(Request.QueryString["ID"]);
            List<string> excregisteredRobots = (from m in db.UP_GET_REGISTERED_Robots(userID) select m.MODULE_NAME).ToList();

            return allRobots.Where(m => !excregisteredRobots.Contains(m.MODULE_NAME)).ToList();
        }
    }

protected void LoadUnregisteredRobots()
    {
        lstUnselectedRobots.Items.Clear();

        //we need to make sure a re=d-g.and FACTORY were selected.
        if (ddlFactories.SelectedIndex > 0 && ddlRegion.SelectedIndex > 0)
        {
//notice this reuses the same code as above any simple retrieves the results for value selected in the dropdown. this value is updated by autopostback true set on the aspx page side.
            lstUnselectedRobots.DataSource = GetUnregisteredRobots(Convert.ToInt32(ddlFactories.SelectedValue));
            lstUnselectedRobots.DataTextField = "Robot_NAME";
            lstUnselectedRobots.DataValueField = "Robot_ID";

            lstUnselectedRobots.DataBind();
        }
    }

protected void btnSelect_Click(object sender, ImageClickEventArgs e)
    {
        List<ListItem> selectedItems = new List<ListItem>();

        //add all the selected items to a list
        foreach (ListItem li in lstSelectItems.Items)
        {
            if (li.Selected)
            {
                selectedItems.Add(li);
            }
        }

        //add the selected items to the selected box
        lstSelectedItems.Items.AddRange(selectedItems.ToArray());

        //remove the selected items from the original list
        foreach (ListItem items in selectedItems)
        {
            lstUnselectedRobots.Items.Remove(items);
        }

        LoadFactories();
    }

    protected void btnRemove_Click(object sender, ImageClickEventArgs e)
    {
        List<ListItem> selectedItems = new List<ListItem>();

        //add all the selected items to a list
        foreach (ListItem li in lstSelectedItems.Items)
        {
            if (li.Selected)
            {
                lstDecommissionRobots.Add(li);
            }
        }

        //add the selected items back to the initial selection box
        lstUnselectedRobots.Items.AddRange(selectedItems.ToArray());

        //remove the selected items from the selected list
        foreach (ListItem items in selectedItems)
        {
            lstDecommissionRobots.Items.Remove(items);
        }

        LoadFactories();
    }

    protected void btnSend_Click(object sender, ImageClickEventArgs e)
    {
        List<USER_ACCESS> FactoryItems = new List<USER_ACCESS>();
        int userid= int.Parse(Session["userid"].ToString());

        try
        {
            if (lstDecommissionRobots.Items.Count > 0)
            {
                //for each Factory item that's selected, add it to the Factory list
                foreach (ListItem li in lstDecommissionRobots.Items)
                {
                    USER_ACCESS regFactory = new USER_ACCESS()
                    {
                        USER_ID = studentID,
                        Robot_ID = Convert.ToInt32(li.Value),
                        EXPIRATION_DATE = Convert.ToDateTime(txtExpDate.Text),
                        CREATED_BY = Users.CurrentUser.UserID.ToString()
                    };

                    FactoryItems.Add(regFactory);
                }

                //Make sure the list got filled and then insert the Factories into the db.
                if (FactoryItems.Count > 0)
                {
                    AndroneticsDAL dalInstance = new AndroneticsDAL();
                    dalInstance.EnrollStudent(FactoryItems);

                    //TODO: replace with update event handle
                    //PopulateFactories(userid);
                    ClearLists();
                    lstDecommissionRobots.Items.Clear();
                    ddlSegment.ClearSelection();
                    ddlFactories.ClearSelection();

                    if (SendToDecommission != null)
                    {
                        SendToDecommission(sender,e);
                    }
                }
            }
            else
            {
                //PopulateFactories(userid);
            }
        }
        catch (Exception ex)
        {
//Utility.HandleError(ex); //send to email, handle, etc or handle in global.asax
        }
    }

    protected void ddlRegion_SelectedIndexChanged(object sender, EventArgs e)
    {
        LoadFactories();
        ddlFactories.SelectedItem.Selected = false;
    }

    protected void ddlFactories_SelectedIndexChanged(object sender, EventArgs e)
    {
        LoadRobots();
    }
}

HTML/ASPX Side:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="DecommissionRobots.ascx.cs" Inherits="DecommissionRobots" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:UpdatePanel ID="upnlContent" runat="server" ChildrenAsTriggers="false"
            UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Panel runat="server" ID="pnlFactorieselection" GroupingText="Decommission Robots">
                    <div class="panelPadding paddingTop10 tableSize">
                        <div>
                            <div class="displayInlineLeftFloat labelSize">
                                <asp:Label runat="server" ID="lblRegion" AssociatedControlID="ddlRegion" Text="Region Name:"
                                    CssClass="labelSize"></asp:Label></div>
                            <div class="displayInlineLeftFloat FactoryDropDowns">
                                <asp:DropDownList runat="server" ID="ddlRegion" AutoPostBack="true" OnSelectedIndexChanged="ddlRegion_SelectedIndexChanged">
                                    <asp:ListItem Text="United States" Value="UnitedStats"></asp:ListItem>
                                    <asp:ListItem Text="United Kingdom" Value="UnitedKingdom"></asp:ListItem>
                                </asp:DropDownList>
                            </div>
                        </div>
                        <div class="clearFloat paddingTop10">
                            <div class="displayInlineLeftFloat labelSize">
                                <asp:Label runat="server" ID="lblFactories" AssociatedControlID="ddlFactories" Text="Factory Name:"
                                    CssClass="labelSize"></asp:Label></div>
                            <div class="displayInlineLeftFloat FactoryDropDowns">
                                <asp:DropDownList runat="server" ID="ddlFactories" AutoPostBack="true" OnSelectedIndexChanged="ddlFactories_SelectedIndexChanged">
                                </asp:DropDownList>
                            </div>
                        </div>
                        <div class="clearFloat paddingTop10">
                            <div class="displayInlineLeftFloat labelSize">
                                <asp:Label runat="server" ID="lblExpDate" AssociatedControlID="txtExpDate" Text="Expiration Date:"
                                    CssClass="labelSize"></asp:Label></div>
                            <div class="displayInlineLeftFloat">
                                <asp:TextBox runat="server" ID="txtExpDate"></asp:TextBox>
                                <asp:CalendarExtender ID="txtExpDate_CalendarExtender" runat="server" DefaultView="Months"
                                    Enabled="True" TargetControlID="txtExpDate">
                                </asp:CalendarExtender>
                            </div>
                        </div>
                        <div class="clearFloat">
                            <br />
                        </div>
                        <div>
                            <div>
                                <span class="listWidth displayInline CenterElement">Unregistered Robots</span><span
                                    id="selectedCaption" class="listWidth displayInline CenterElement">Selected
                                    Robots</span></div>
                            <div id="RegSection" class="displayInlineLeftFloat">
                                <asp:ListBox ID="lstUnregisteredRobots" runat="server" CssClass="FloatLeft listWidth" Rows="10"
                                    SelectionMode="Multiple"></asp:ListBox>
                                <div id="selectButtons" class="floatContainer">
                                    <div>
                                        <asp:ImageButton runat="server" ID="btnSelect" AlternateText="select" OnClick="btnSelect_Click"
                                            ImageUrl="~/Images/special_right.gif" /></div>
                                    <div class="buttonTopMargin5">
                                        <asp:ImageButton runat="server" ID="btnRemove" AlternateText="remove" ImageUrl="~/Images/special_left.gif"
                                            OnClick="btnRemove_Click" /></div>
                                </div>
                                <asp:ListBox runat="server" ID="lstDecommissionRobots" Rows="10" SelectionMode="Multiple"
                                    CssClass="listWidth"></asp:ListBox>
                            </div>
                            <div id="sendButton">
                                <asp:ImageButton runat="server" ID="btnSend" AlternateText="Enroll" ImageUrl="~/Images/btn_send.gif"
                                    OnClick="btnSend_Click" /></div>
                        </div>
                    </div>
                </asp:Panel>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="ddlRegion" EventName="SelectedIndexChanged" />
                <asp:AsyncPostBackTrigger ControlID="ddlFactories" EventName="SelectedIndexChanged" />
                <asp:AsyncPostBackTrigger ControlID="btnSelect" EventName="Click" />
                <asp:AsyncPostBackTrigger ControlID="btnRemove" EventName="Click" />
                <asp:AsyncPostBackTrigger ControlID="btnSend" EventName="Click" />
            </Triggers>
        </asp:UpdatePanel>

References
Fraction Of The Blogosphere, https://ronniediaz.com/2010/12/21/lambda_functions_in_-net/

IIS 7 Remote Administration Manager

At the time of writing this article, in the latest version of Windows (Vista,7 and Server 2008), IIS management has changed quite a bit.

IIS7 features some very cool remote management capabilities. In an environment where developers may need access to IIS, but not necessarily the server, or too many remote logins to the server fill up the TS licenses, using IIS remote management can save ALOT of your time and money.

Consider the following scenarios:

New site needs to be added to IIS or changes to existing site need to be made.

1) Developer does not have RDP access due to corporate security policies or may be outside consultant, etc and submits ticket/request for new site to be added
2) Count the time delay until ticket is responded, time to form responses and time spent on actual technical changes.
3) If details regarding site changes sent by developer are adequate, IT helpdesk applies the changes and notifies developer setup successful. If additional info is needed, helpdesk must request more information, then repeat steps 2-3 until complete.

Even if only 1% of all sites require follow up, and approximate ticket response and IIS configuration time is lets say 3-4 hours including delay until ticket is received; if you create 50 sites / annually this equates to 150-200 hours spent simply on site setup.

If your company outsources IT helpdesk, or response time is even slower, 12-24 hours, this is now 600-1200 hours of delay at the same rate of 50 sites / annually.

To save time (and money), consider cross-training developers that don’t know IIS, and setup remote administration in IIS7.

Note some Vista and Windows 7 installations do not come with the manager, and it will have to be downloaded from IIS.net.

For walkthroughs on this configuration and more information, see references below.

References:
TrainSignalTraining, “Remote Administration of IIS 7: Install, Configure, Connect”, http://www.trainsignaltraining.com/iis-7-remote-administration
IIS.Net, “IIS Manager for Remote Administration”, http://www.iis.net/download/IISManager