web.config

<configuration>

……

<system.web>

       <database>

        <add key="strConn" value="server=107.120.65.99;database=DB;uid=DB;pwd=DB" />

</database>

</system.web>

……

</configuration>

Global.asax.cs

protected void Session_End(Object sender, EventArgs e)

{

        Application.Lock();

        Application.Remove(Session.SessionID.ToString());

        Application["OL_UserCount"]=(int)Application["OL_UserCount"]-1;

        Application.UnLock();

}

login.aspx

<table class="logintable">

<tr>    <td colspan="2" class="tdcaption"><font class="fcaption">ログイン</font></td></tr>

<tr>        <td><font class="font100">ユーザーID:</font></td></tr>

        <td><asp:TextBox CssClass="itxt" ID="txtName" Runat="server"></asp:TextBox></td></tr>

<tr>        <td><font class="font100">パスワード:</font></td>

        <td><asp:TextBox CssClass="itxt" ID="txtPwd" TextMode="Password" Runat="server"></asp:TextBox></td></tr>

<tr>        <td><asp:Button CssClass="ibutton" ID="btnSubmit" Text="login" Runat="server"></asp:Button></td>

        <td><input type="reset" class="ibutton" name="btnReset" value="reset"></td></tr>

</table>

login.aspx.cs

using System.Collections.Specialized;

using System.Data.SqlClient;

public void LoginBySQL()

{

     string strConn=(String) ((NameValueCollection) Context.GetConfig("system.web/database"))["strConn"];

     using (SqlConnection conn = new SqlConnection(strConn))

     {

         SqlCommand cmd = new SqlCommand("sp_IDPWD",conn);

         cmd.CommandType=CommandType.StoredProcedure;    //这里采用存储过程

         cmd.Parameters.Add("@ID",SqlDbType.VarChar,20);