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aspx:
<form id="form1" runat="server">
<div>
<input name="TextBox1" type="text" />
<asp:Button ID="Search" runat="server" OnClick="Search_Click" Text="搜尋" />
</div>
</form>

cs:
protected void Page_Load(object sender, EventArgs e)
{
wl("Page_Load");
if (IsPostBack)
{
foreach (var item in Request.Form.AllKeys)
{
wl(item+":"+Request.Form[item]);
}
}
}

protected void Search_Click(object sender, EventArgs e)
{
wl("Search_Click");
}
void wl(string a)
{
Response.Write(a + "<br />");
}
/*
enter送出表單結果：
Page_Load
__VIEWSTATE:/wEPDwUKMjA0OTM4MTAwNGRkLghzRoHNOnf2daA4+x7iECQbZnc=
__EVENTVALIDATION:/wEWAgLMrZrVAgKn2pL8CXNlK04N8Ok4vSWMEW5vVqBdfbv2
TextBox1:
*/