✅ my event handler cant find my textbox

private string createMacroFile()
        {
            Form nameInput = new Form();
            nameInput.Text = "Name";
            nameInput.Icon = SystemIcons.Question;
            nameInput.MinimizeBox = false;
            nameInput.MaximizeBox = false;
            nameInput.FormBorderStyle = FormBorderStyle.FixedSingle;
            nameInput.Size = new Size(200, 130);


            Label labelA = new Label();
            labelA.AutoSize = true;
            labelA.Text = "Wie möchtest du den Macro nennen?";
            nameInput.Controls.Add(labelA);

            TextBox textBoxA = new TextBox();
            textBoxA.Location = new Point(6, 23);
            textBoxA.Width = 150;
            nameInput.Controls.Add(textBoxA);

            Button btnOkay = new Button();
            btnOkay.Text = "Okay";
            btnOkay.AutoSize = true;
            btnOkay.Location = new Point(100, 50);
            nameInput.AcceptButton = btnOkay;
            btnOkay.Click += btnOkay_Click;
            nameInput.Controls.Add(btnOkay);

            Button btnCancel = new Button();
            btnCancel.Text = "Cancel";
            btnCancel.AutoSize = true;
            btnCancel.Location = new Point(6, 50);
            btnCancel.Click += btnCancel_Click;
            nameInput.Controls.Add(btnCancel);

            nameInput.ShowDialog();

            return "test";
        }

        private void btnOkay_Click(object sender, EventArgs e)
        {
            File.WriteAllText(Path.Combine(macroPath, textBoxA.text), "");
        }

private string createMacroFile()
        {
            Form nameInput = new Form();
            nameInput.Text = "Name";
            nameInput.Icon = SystemIcons.Question;
            nameInput.MinimizeBox = false;
            nameInput.MaximizeBox = false;
            nameInput.FormBorderStyle = FormBorderStyle.FixedSingle;
            nameInput.Size = new Size(200, 130);


            Label labelA = new Label();
            labelA.AutoSize = true;
            labelA.Text = "Wie möchtest du den Macro nennen?";
            nameInput.Controls.Add(labelA);

            TextBox textBoxA = new TextBox();
            textBoxA.Location = new Point(6, 23);
            textBoxA.Width = 150;
            nameInput.Controls.Add(textBoxA);

            Button btnOkay = new Button();
            btnOkay.Text = "Okay";
            btnOkay.AutoSize = true;
            btnOkay.Location = new Point(100, 50);
            nameInput.AcceptButton = btnOkay;
            btnOkay.Click += btnOkay_Click;
            nameInput.Controls.Add(btnOkay);

            Button btnCancel = new Button();
            btnCancel.Text = "Cancel";
            btnCancel.AutoSize = true;
            btnCancel.Location = new Point(6, 50);
            btnCancel.Click += btnCancel_Click;
            nameInput.Controls.Add(btnCancel);

            nameInput.ShowDialog();

            return "test";
        }

        private void btnOkay_Click(object sender, EventArgs e)
        {
            File.WriteAllText(Path.Combine(macroPath, textBoxA.text), "");
        }