C# - how to get text values delimited by commas into textboxes?

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C#

WinForms

I am trying to get multiple values from a text file delimited by commas and copy them into a total of 12 textboxes (eg: value '1' goes to textBox1, value '2' goes to textBox2 and so on...)

I am using Windows Forms and I am getting the error below:

System.IndexOutOfRangeException: 'Index was outside the bounds of the array.'

The values from my text files are these:

1,2,3,4,5,6,
7,8,9,10,11,12,

Below is what I tried so far:

namespace WindowsFormsApp18
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        public class Cliente
        {
            public string DUTA1A { get; set; }
            public string DUTA1B { get; set; }
            public string DUTA1C { get; set; }
            public string DUTA1D { get; set; }
            public string DUTA1E { get; set; }
            public string DUTA1F { get; set; }
            public string DUTA2A { get; set; }
            public string DUTA2B { get; set; }
            public string DUTA2C { get; set; }
            public string DUTA2D { get; set; }
            public string DUTA2E { get; set; }
            public string DUTA2F { get; set; }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            System.IO.StreamReader reader = new System.IO.StreamReader(@"C:\\DUTA\YourFile.txt");
            string line;
            while ((line = reader.ReadLine()) != null)
            {
                string[] dados = line.Split(',');
                int codigo = int.Parse(dados[0]);
                string DUTA1A = dados[0];
                string DUTA1B = dados[1];
                string DUTA1C = dados[2];
                string DUTA1D = dados[3];
                string DUTA1E = dados[4];
                string DUTA1F = dados[5];
                string DUTA2A = dados[6];
                string DUTA2B = dados[7];
                string DUTA2C = dados[8];
                string DUTA2D = dados[9];
                string DUTA2E = dados[10];
                string DUTA2F = dados[11];

    
                textBox1.Text = DUTA1A;
                textBox2.Text = DUTA1B;
                textBox3.Text = DUTA1C;
                textBox4.Text = DUTA1D;
                textBox5.Text = DUTA1E;
                textBox6.Text = DUTA1F;
                textBox7.Text = DUTA2A;
                textBox8.Text = DUTA2B;
                textBox9.Text = DUTA2C;
                textBox10.Text = DUTA2D;
                textBox11.Text = DUTA2E;
                textBox12.Text = DUTA2F;
            }
        }
    }
}

Any suggestions?

What I have tried:

Using 6 values there is no errors. Tried to modify the indexes too.