你好，
如果你用服务器端的ajax中的timer控件恐怕不好调整textbox的scrollbar的高度.如果你想设置或者获取application，建议通过前端脚本调用webservice这样的方式来实现。
下面是个纯前台脚本方面的例子，至于调用后台webservice方面的你可以在网上找找，应该很多。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="TextBox1" runat="server" Height="218px" Text="fafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaf"
TextMode="MultiLine" Width="403px"></asp:TextBox>
</form>
<script type="text/javascript" language="javascript">
window.setInterval(changeValue, 1000);
function setTextBoxValue() {
PageMethods.
}
function changeValue() {
var tb = document.getElementById('<%=TextBox1.ClientID %>');
var val = tb.value;
tb.value = val + "\n" + "fafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfafafaffafadfdafafasdfaf";
tb.scrollTop = tb.scrollHeight;
}
</script>
</body>
</html>
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