AJAX :: Reuse Update Panel In The Same Page?

in one table

<asp:UpdatePanel ID="Operations" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="txtOperations" runat="server" Font-Names="Code128bWin" OnTextChanged="OperationEventHandler" AutoPostBack="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID = "txtOperations" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>

and a label in other table

<asp:Label ID="lblOperation" Text="OperationID not Valid" runat="></asp:Label>

and the code behind page is

protected void OperationEventHandler(object sender, EventArgs e)
{
GridView GridViewValidOps = new GridView();
GridViewValidOps.DataSource = TB.ValidateOperations(txtOperations.Text);
GridViewValidOps.DataBind();
if (GridViewValidOps.Rows.Count <= 0)
{
lblOperation.Text = "OperationID Not Valid";
}
}

Is there a way to use the same update panel for the label , because i want the value of the label to be updated if the user enters wrong value.