关于整形数格式化的问题？？

Question

tryint i = 963258741;
Response.Write(i.ToString("#,##0"));

Answer 1

public string ConvertToCurrency(double strTemp)
    {
        return strTemp.ToString("N", NumberFormatInfo.CurrentInfo);
    }

Answer 2

int i = 963258741;
                string a= i.ToString("#,##0");

Answer 3

自己算........呵呵 变态
        string xx = TextBox1.Text;
        int i = xx.Length % 3;
        int q = 0;
        foreach (char x in xx)
        {
            q++;
            Response.Write(x.ToString());
            if (q%3==i &&q!=xx.Length)
            {
                Response.Write(",");
            }
        }