The variable 'variable_name' is either undeclared or was never assigned

Question

I have a question related to the error on the title. Im working with c# and Visual Studio 2010.

I have a form declared as \"public class FormularioGeneral : Form\",

Answer 1

In my case, I had an older Windows Forms project where InitializeComponents() started like this:

private void InitializeComponent()
{
    var componentResourceManager = new ComponentResourceManager(typeof(MyForm));
    ...

This resulted in an error message later on when accessing the componentResourceManager inside InitializeComponent():

The variable 'componentResourceManager' is either undeclared or was never assigned.

When comparing with a newly created form, I saw that it was similar to my non-working form, except for one thing:

The variable was not named componentResourceManager but simply resources.

Solution

After doing a rename on my variable to also have the name resources, everything works successfully:

private void InitializeComponent()
{
    var resources = new ComponentResourceManager(typeof(MyForm));
    ...

The Windows Forms Designer in Visual Studio 2017 did open the form correctly.