1 protected void Button1_Click(object sender, EventArgs e)
 2 {
 3         string message = TextBox1.Text.Trim();
 4         int result;
 5         if(isNumberic(message,out result))
 6         {
 7             string tt="<script>alert('匹配成功，转换后的整数为"+result+"')</script>";
 8             Page.ClientScript.RegisterStartupScript(this.GetType(), "", tt);
 9         }
10         else
11             Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('匹配失败！')</script>");
12 }
13 protected bool isNumberic(string message,out int result)
14 {
15        //判断是否为整数字符串
16        //是的话则将其转换为数字并将其设为out类型的输出值、返回true, 否则为false
17         result = -1;   //result 定义为out 用来输出值
18         try
19         {
20           //当数字字符串的为是少于4时，以下三种都可以转换，任选一种
21           //如果位数超过4的话，请选用Convert.ToInt32() 和int.Parse()
22 
23           //result = int.Parse(message);
24           //result = Convert.ToInt16(message);
25             result = Convert.ToInt32(message);   
26             return true;
27         }
28         catch
29         {
30             return false;
31         }
32 }

 1 protected bool isNumberic(string message,out int result)
 2 {
 3         System.Text.RegularExpressions.Regex rex=
 4         new System.Text.RegularExpressions.Regex(@"^\d+$");
 5         result = -1;
 6         if (rex.IsMatch(message))
 7         {
 8             result = int.Parse(message);
 9             return true;
10         }
11         else
12             return false;
13 }

 1 protected void Button1_Click(object sender, EventArgs e)
 2 {
 3         string message = TextBox1.Text.Trim();
 4         isNumeric(message); //判断字符串是否为5为整数字符串
 5 }
 6 protected void isNumeric(string message)
 7 {
 8        if (message != "" && Regex.IsMatch(message, @"^\d{5}$"))
 9        {
10           //成功
11           Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('匹配通过！确实是五位的整数字符串')</script>");
12        }
13        else
14            //失败
15            Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('匹配失败！')</script>");
16 }