ustalenie zakresu podawanych liczb do textboxa

        TextBox[] textBoxArray;
        int PositionY = 0;
        private void Form_Load(object sender, EventArgs e)
        {
            textBoxArray = new TextBox[textBoxCount];

            for (int i = 0; i < textBoxCount; i++)
            {
                textBoxArray[i] = new TextBox();

                textBoxArray[i].TextChanged += Form1_TextChanged;
                textBoxArray[i].Top = PositionY;

                Controls.Add(textBoxArray[i]);
                PositionY += PositionY + textBoxArray[i].Height;
            }
            
        }

        private void Form_TextChanged(object sender, EventArgs e)
        {
            int minNum = 0;
            int maxNum = 5;

            int result;

            if (int.TryParse(((TextBox)sender).Text, out result))
            {
                if (result >= minNum && result <= maxNum)
                    ((TextBox)sender).Text = result.ToString();
                else
                    ((TextBox)sender).Text = "0";
            }
            else if(((TextBox)sender).Text != string.Empty)
            {
                ((TextBox)sender).Text = "0";   
            }
        }