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ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, Page.GetType(), new Guid().ToString(), "alert('something');",true);
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:Button ID="Button1" runat="server" Text="Button"
onclick="Button1_Click1" />
</ContentTemplate>
</asp:UpdatePanel>
protected void Button1_Click1(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this.UpdatePanel1, Page.GetType(), "", "alert('录入的进货日期不应大于今天日期,请重新录入正确的进货日期!')", true);
}