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<form id="form1" runat="server">
<div>
<%=id %>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</div>
</form>
public string id = "";
protected void Page_Load(object sender, EventArgs e)
{
//id = "123456";想赋值就赋值。
}
protected void Button1_Click(object sender, EventArgs e)
{
id = "aaaaa";
}