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http://zhangchenliang.blogbus.com/logs/1666078.html

今天终于搞定了表单验证。虽然说技术含量不高，但是毕竟是自己搞定的。心理还是很高兴！
<configuration>
   <system.web>
      <authentication mode = "Forms">
         <forms name="ProgAspNetCookie" loginUrl="csLoginForm.aspx" />
      </authentication>

      <authorization>
         <deny users="?" />
      </authorization>
   </system.web>
</configuration>

 DEMO页面

<%@ Page Language="vb" %>
<script runat="server">
   sub btn_Click(ByVal Sender as Object, _
                 ByVal e as EventArgs)
      if FormsAuthentication.Authenticate(txtUserName.Text, _
                                          txtPassword.Text) then
         FormsAuthentication.RedirectFromLoginPage(txtUserName.Text, _
                                                   false)
      else
         lblMessage.Text = "Not Authenticated:<br>" & txtUserName.Text & _
                           "<br>" & txtPassword.Text
      end if
   end sub
</script>

Example 19-8. Login form using SetAuthCookie in VB.NET

<%@ Page Language="vb" %>
<script runat="server">
   sub btn_Click(ByVal Sender as Object, _
                 ByVal e as EventArgs)
      if FormsAuthentication.Authenticate(txtUserName.Text, _
                                          txtPassword.Text) then
         FormsAuthentication.SetAuthCookie(txtUserName.Text, _
                                           false)
         Response.redirect("default.aspx")
      else
         lblMessage.Text = "Not Authenticated:<br>" & txtUserName.Text & _
                           "<br>" & txtPassword.Text
      end if
   end sub
</script>