C#加法器的问题
请问
IF（c==a+b）答对了我就加一分如何实现呢？
我用过
if(c==a+b)
{int sum;
for(n=0;n<100;n++)
sum+=n
string s=sum.TOstring();
label5.s=sum;
}
行不通!



源程序如下：
private void Form1_Load(object sender, EventArgs e)
{
int n;
Random my = new Random();
n=my.Next(5);
label1.Text = n.ToString();//为了把label1转换为字符串
n = my.Next(10);
label3.Text = n.ToString();


}

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{

if (!(char.IsDigit(e.KeyChar) == true)|| e.KeyChar == 8)
e.Handled = true;
if (e.KeyChar == 13 )
{
int n=0;

if (textBox1.Text == "")
{
MessageBox.Show("未输入答案");
return;
}
int a, b, c;
a = int.Parse(label1.Text);
b = int.Parse(label3.Text);
c = int.Parse(textBox1.Text);

if (c == a + b)
{
MessageBox.Show("真聪明答对了");
Form1_Load(null, null);//清零
textBox1.Text = "";

textBox1.Focus();






}
else if (c != a + b)
{

Form1_Load(null, null);//清零
textBox1.Text = "";
textBox1.Focus();

}

else
{
MessageBox.Show ("答错了，重试一次");
textBox1.Text = "";
textBox1.Focus();
}

}
}

[解决办法]
写的真丑
[解决办法]

 public partial class Form1 : Form
    {
        int m_FirstValue = 0;
        int m_SecondValue = 0;
        public Form1()
        {
            InitializeComponent();
            LoadValue();
        }

        private void LoadValue()
        {
            Random my = new Random(DateTime.Now.Millisecond); 
 
            m_FirstValue = my.Next(5);
            lbFirst.Text = m_FirstValue.ToString();
            m_SecondValue = my.Next(10);
            lbSecond.Text = m_SecondValue.ToString();
        }

        private void txtResult_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!(char.IsDigit(e.KeyChar) == true)