整数累加

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/**         * 整数累加         */        private void button1_Click(object sender, EventArgs e)        {            string number1 = textBox1.Text;            string number2 = textBox2.Text;            int numberInt1;            int numberInt2;            if (!int.TryParse(number1, out numberInt1))            {                MessageBox.Show("请输入整数");                return;            }            if (!int.TryParse(number2, out numberInt2))            {                MessageBox.Show("请输入整数");                return;            }            if (!(numberInt1 < numberInt2))            {                MessageBox.Show("第一个数必须小于第二个数");                return;            }            int sum = 0;            for (int i = numberInt1; i <= numberInt2; i++ )            {                sum = sum + i;            }                        textBox3.Text = sum.ToString();        }