How to refer to a control in the cs file

I placed a control named "lstEvalItemName" in the aspx file.

<asp:ListBox id="lstEvalItemName" runat="server" AutoPostBack="True" Height="1.2in"
                                Width="2.28in" BackColor="Azure"  
                                SelectionMode="Single"
                                OnSelectedIndexChanged = "lstEvalItemName_Click">
                 </asp:ListBox>

Then I tried to refer to it in the cs file.

intEvalItemID = int.Parse(lstEvalItemName.SelectedValue);

The name 'lstEvalItemName' does not exist in the current context.

This happens with all the controls on the page.

This page is attached to a master page.

What do I need to change?

Thanks
DovbermanAsked:
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Albert Van HalenAnalyst developerCommented:
If your project uses designer files, it could be that the designer file is not up to date. (could be due to changes made during debugging).
Try to re-save your aspx and rebuild the solution.
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Luis PérezSoftware Architect in .NetCommented:
Try

intEvalItemID = int.Parse(this.lstEvalItemName.SelectedValue);

Hope that helps.
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DovbermanAuthor Commented:
Did not work.

This does not work either.

intEvalItemID = int.Parse(this.FindControl("lstEvalItemName").SelectedValue);

Ideally, I would like to reference the control as a public listbox and give it a name.

public ListBox myListBox;

Then I would like to set myListBox equal to the actual control on the page.

?? myListBox == ("lstEvalItemName")
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Luis PérezSoftware Architect in .NetCommented:
Where is located your lstEvalItemName ListBox? In the master page or in the derived page?
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DovbermanAuthor Commented:
It is in a derived page.

This works, but is it the preferred way?

       public ListBox myListBox;

   
        protected void Page_Load(object sender, EventArgs e)
        {
            myListBox = FindControl("lstEvalItemName") as ListBox;
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Luis PérezSoftware Architect in .NetCommented:
Well, in theory it would't be necessary to declare the variable by yourself. Normally, you would be able to access directly by its real name ("lstEvalItemName").

You said the control is declared in the derived page. Are you trying to access it from the master's Page_Load?
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Albert Van HalenAnalyst developerCommented:
By default all controls added to a page are protected members. It is accessible from within that page and only from within that page.
If you want to access the control from outside the page you have to make it public or use FindControl method.
public ListBox SelectBox
{
    get { return lstEvalItemName; }
}

Open in new window

You can then access SelectBox in the derived page
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DovbermanAuthor Commented:
The control is acting as if it is protected. However the control I am trying to reference should be available directly.

I placed a control named "lstEvalItemName" in the aspx file.

<asp:ListBox id="lstEvalItemName" runat="server" AutoPostBack="True" Height="1.2in"
                                Width="2.28in" BackColor="Azure"  
                                SelectionMode="Single"
                                OnSelectedIndexChanged = "lstEvalItemName_Click">
                 </asp:ListBox>

Then I tried to refer to it in the cs file.

I am not trying to access it from the master's Page_Load?

intEvalItemID = int.Parse(lstEvalItemName.SelectedValue);

It should be accessible from within that page.
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DovbermanAuthor Commented:
Thank you.
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