[Solved] simple calculator that shows the different between 2 numbers in C# [closed]

Write this code in the click event of calculate button

    private void Calculate_Click(object sender, EventArgs e)
    {
        if (textBox1.Text != "" && textBox2.Text != "")
        {
            int diff = (Convert.ToInt32(textBox1.Text) - Convert.ToInt32(textBox2.Text));
            textBox3.Text = diff.ToString();
            if (diff >= 0)
            {
                textBox3.ForeColor = Color.Green;
            }
            else
                textBox3.ForeColor = Color.Red;

        }
        else
        {
            MessageBox.Show("PLZ Enter the balances");
        }
    }