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missing a using directive or an assembly reference

Posted on 2006-06-23
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1,822 Views
Last Modified: 2008-01-09
I'm a newbie to .net and C#...just starting to learn my way around.

I'm trying to create a simple user control with a custom unordered list.

namespace compass.user_controls
{
      using System;
      using System.Data;
      using System.Drawing;
      using System.Web;
      using System.Web.UI.WebControls;
      using System.Web.UI.HtmlControls;

      /// <summary>
      ///            Summary description for TopNavBar.
      /// </summary>
      public class TopNavBar : System.Web.UI.UserControl
      {
            protected System.Web.UI.WebControls.ListBox ListBox1;

            private void Page_Load(object sender, System.EventArgs e)
            {
                  // Put user code to initialize the page here
                  BulletedList MyList = new BulletedList();
                  //MyList.BulletStyle = BulletStyle.Numbered;
                  ListItem MyItem = new ListItem();
                  MyItem.Text = "About Us";"Contact Us";"Customer Support";"Site Map";
                  MyList.Items.Add(MyItem);
                  form1.Controls.Add(MyList);
            }

What is the directive I need to add?

Thanks.
0
Comment
Question by:-Dman100-
16 Comments
 
LVL 12

Expert Comment

by:gbzhhu
ID: 16970667
Are you referencing System.web and system.data.  Check your project explorer, expand the references, see if they are in there.  If they are not add the refrences
0
 
LVL 25

Expert Comment

by:dstanley9
ID: 16970694
Which line is the compiler error on?
0
 

Author Comment

by:-Dman100-
ID: 16971009
both system.web and system.data are refereced.

here are the lines the errors are thrown:

BulletedList MyList = new BulletedList();

MyList.Items.Add(MyItem);
0
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LVL 52

Expert Comment

by:Carl Tawn
ID: 16971100
Are you using .Net 1.1 or 2.0 ?
0
 

Author Comment

by:-Dman100-
ID: 16971115
.Net 1.1 Framework
0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 16971226
Then thats your problem, the BulletedList control was introduced in 2.0.
0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 16971235
There are some suggested workarounds for creating a BulletedList with 1.1 here:

    http://aspalliance.com/247
0
 

Author Comment

by:-Dman100-
ID: 16971483
Is an arraylist available in .Net 1.1?

Based on one of the workaround solutions I could bind an arraylist

<ul>
<asp:Repeater ID="TopMenu" Runat="server">
<ItemTemplate>
<li>
<%# DataBinder.Eval(Container.DataItem, "MenuItems") %>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>

ArrayList MenuItems = New ArrayList()

I'm still getting errors and not making much headway with this.
0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 16971553
Yup, ArrayList is under the System.Collections namespace.
0
 

Author Comment

by:-Dman100-
ID: 16971625
is there a good article or tutorial on creating an arraylist using C#?

I've added the System.Collections namespace

But, I'm still having trouble creating the arraylist, which is just a symptom of not know what I'm doing.

Thanks for your help.
0
 

Author Comment

by:-Dman100-
ID: 16971743
well, I made some headway:

namespace compass.user_controls
{
      using System;
      using System.Collections;
      using System.Data;
      using System.Drawing;
      using System.Web;
      using System.Web.UI.WebControls;
      using System.Web.UI.HtmlControls;

      /// <summary>
      ///            Summary description for TopNavBar.
      /// </summary>
      public class TopNavBar : System.Web.UI.UserControl
      {
            public ArrayList MenuItems = new ArrayList();

      private void Page_Load(object sender, System.EventArgs e)
            {
                  // Put user code to initialize the page here
                  
                  ArrayList MenuItems = new ArrayList();
                  MenuItems.Add("About Us");
                  MenuItems.Add("Contact Us");
                  MenuItems.Add("Customer Support");
                  MenuItems.Add("Site Map");
            }

I'm not getting any errors, but where am I going wrong on binding my arraylist?

<ul>
<asp:Repeater ID="TopMenu" Runat="server">
<ItemTemplate>
<li>
<%# DataBinder.Eval(Container.DataItem, "MenuItems") %>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>
0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 16971752
What exactly are you having trouble with ?

ArrayList is fairly simple:

    public void Wibble()
    {
        ArrayList arr = new ArrayList();
        arr.Add("Value 1");
        arr.Add("Value 2");
    }
0
 

Author Comment

by:-Dman100-
ID: 16971861
I almost have it working.  This is what I've got:

repeater control:

<ul>
<asp:Repeater ID="TopMenu" Runat="server">
<ItemTemplate>
<li>
<%# DataBinder.Eval(Container.DataItem, "MenuItems") %>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>

code-behind:

namespace compass.user_controls
{
using System;
using System.Collections;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

/// <summary>
///            Summary description for TopNavBar.
/// </summary>
public class TopNavBar : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.Repeater TopMenu;
public ArrayList MenuItems = new ArrayList();

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
                  
ArrayList MenuItems = new ArrayList();
MenuItems.Add("About Us");
MenuItems.Add("Contact Us");
MenuItems.Add("Customer Support");
MenuItems.Add("Site Map");
                  
TopMenu.DataSource = MenuItems;
TopMenu.DataBind();
}

compiler error message:

DataBinder.Eval: 'System String' does not contain a property with the name MenuItems
0
 

Author Comment

by:-Dman100-
ID: 16972747
do I need to provide more information or is my question presented incorrectly?
0
 
LVL 52

Accepted Solution

by:
Carl Tawn earned 500 total points
ID: 16972824
Binding usually has to be done to a property rather than just a public member. You'll also need to change the name of your ArrayList in order to avoid a name clash:

So change:

    public ArrayList MenuItems = new ArrayList();

To:

    private ArrayList _MenuItems = new ArrayList();

And add:

    public ArrayList MenuItems
    {
         get { return _MenuItems; }
         
         // only add this next line if the compiler complains
         set { _MenuItems = value; }
    }

You'll also need to change any other reference to MenuItems in your code to _MenuItems.
0
 

Author Comment

by:-Dman100-
ID: 16972869
thank you carl

what would be the better approach to bind the arraylist to my repeater control?
0

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