A better way to find object?

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C#

optimization

I have a form with 7 buttons and 7 comboboxes. When I click one of the buttons, I want to put text into the corresponding combobox, so button number 4 puts text into combobox4.

Simple enough, however, I do not want to have to repeat my code, I want it all in one block, so one chunk handles everything.

I am using FindControl, as we posted many times before in here, and elsewhere, and it works, but you can see from my switch statement, that I am still repeating code. I want to crunch that switch down to a single entry.

I created a function called AddText, it requires a string, and an object in order to work. I can then do a for loop to feed it, but not sure how to get the component for the combobox object to send it. In the switch statement, I simply put the name in there and the backend knows what object I want, but how to do that in a loop?

What I have tried:

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

        private void button1_Click(object sender, EventArgs e)
        {
            Button aButton = (Button)sender;
            string lastchar = aButton.Text.Substring(aButton.Text.Length - 1);
            ComboBox cbFound;

            string cbName = "comboBox" + lastchar;

            switch (lastchar)
            {
                case "1":
                    cbFound = (ComboBox)FindControl(cbName, comboBox1);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "2":
                    cbFound = (ComboBox)FindControl(cbName, comboBox2);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "3":
                    cbFound = (ComboBox)FindControl(cbName, comboBox3);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "4":
                    cbFound = (ComboBox)FindControl(cbName, comboBox4);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "5":
                    cbFound = (ComboBox)FindControl(cbName, comboBox5);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "6":
                    cbFound = (ComboBox)FindControl(cbName, comboBox6);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
                case "7":
                    cbFound = (ComboBox)FindControl(cbName, comboBox7);
                    if (cbFound != null)
                        cbFound.Text = "Yay";
                    break;
            }

            //Attempt to crunch this down to one function call, how to get component name (combobox1) from string ("combobox1")?
            for (int cnt = 1; cnt < 8; cnt++)
            {
                AddText(lastchar, (ComboBox)cbName);
            }
        }

        private void AddText(string cbName, ComboBox cbToFind)
        {
            ComboBox cbFound = (ComboBox)FindControl(cbName, cbToFind);
            if (cbFound != null)
                cbFound.Text = "Yay";
        }

        public static Control FindControl(string controlId, Control container)
        {
            if (container.Name == controlId)
                return container;

            foreach (Control control in container.Controls)
            {
                Control c = FindControl(controlId, control);
                if (c != null)
                    return c;
            }
            return null;
        }
    }
}