string id = yonghuming.Text.ToString();
        string pwd = mima.Text.ToString();
        OleDbConnection connection = new OleDbConnection();
        connection.ConnectionString = "provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Server.MapPath(@"~\App_Data\ping.mdb");
        string oledb = "select * from login where yonghu='" + id + "'and password1='" + pwd + "'";
        OleDbCommand command = new OleDbCommand(oledb, connection);
        connection.Open();
        OleDbDataReader rs = command.ExecuteReader();
        if(rs.Read())
        {
            Session["uid"] = rs["id"].ToString();
            Response.Write("<script language='javascript'>alert('恭喜您注册成功');</script>");
            Label3.Text = yonghuming.Text + ",";
            yonghuming.Text = "";
            mima.Text = "";
}
else
        {
            Response.Write("<script language='javascript'>alert('对不起您没有注册成功');</script>");
            mima.Text = "";
        }
        connection.Close();
    为什么在调试时,出现异常IndexOutOfRangeException
    列表中的最大索引小于列表的大小!