c# - Why couldn't I access the comboBox in Winform?

Question

The form1 has three comboboxes. In the form I tried to create the below code.

public partial class Form1 : Form
{
    private List<ComboBox> comboBoxes = new List<ComboBox>() 
    {
        combobox1,combobox2,combobox3
    };
}

I am getting the error like

A field initializer cannot reference the non-static field, method, or property 

But I can access these comboxes inside the function. I want to create the list of comboboxes. Tell me why I couldn't access it, and How to achieve this?

Answer 1

You need to add the controls in a method

        public List<ComboBox> comboBoxes = new List<ComboBox>()

        public Form1()
        {
            InitializeComponent();

            comboBoxes.AddRange(new ComboBox[] {comboBox1, comboBox2, comboBox3});
        }

Answer 2

Compiler Error CS0236: Instance fields cannot be used to initialize other instance fields outside a method.

You can initialize list in constructor after initializing controls:

public partial class Form1 : Form
{
    public Form1()
    {
        //...
        comboBoxes = new List<ComboBox>() { combobox1,combobox2,combobox3 };
    }
}