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MS-Windows Troubleshooting

Name 'NNNN' is not declared

Symptom:

When compiling, the compiler generates the following error:

Name 'NNNN' is not declared.'

where 'NNNN' is the name of a variable.

Cause:

The compiler does not recognise the variable 'NNNN'. This is either because the variable name is miss-spelt or because the compiler could not find a corresponding definition.

Remedy:

• A common cause is a simple misspelling where the identifier is used. For example:

dim number as Integer;
numbr := 1;

Here the identifier is defined as 'number' but used in the code as 'numbr'. The solution is to correct the spelling.

• If the name is referring to an identifier then it may be that the reference needs to be qualified. For example:

Imports System.Web.HttpContext
Module Example
    Function ExampleProc() as String
        return Application("name")
.
.
[Error] Name 'Application' is not declared.

Try replacing "Application" with "Current.Application".

• The most common cause is that the namespace that defines the name is missing. Identify and import the required namespace.

The following table (which is not exhaustive) lists identifiers together with the namespace and any qualification that might typically be required:

Name	Namespace	Qualified Name
Abs	Math	Math.Abs
AnchorStyles	System.Windows.Forms
Application	System.Web.HttpContext	Current.Application
CultureInfo	System.Globalization
Current	System.Web.HttpContext
Debug	System.Diagnostics
Directory	System.IO
Encoding	System.Text
EventLog	System.Diagnostics
File	System.IO
HtmlEncode	System.Web.HttpUtility
HttpContext	System.Web
HttpRuntime	System.Web
HttpUtility	System.Web
ImageFormat	System.Drawing.Imaging
Marshal	System.Runtime.InteropServices
Request	System.Web.HttpContext	Current.Request
Round	Math	Math.Round
Server	System.Web.HttpContext	Current.Server
SmptMail	System.Web.Mail
User		HttpContext.Current.User

These notes are believed to be correct for VB.NET for .NET 1.1 and .NET 2, and may apply to other versions as well.