I have the following in my aspx code:

   <asp:TextBox ID="user_name" runat="server" CssClass="textbox" Placeholder="Name" required="required"></asp:TextBox>

<asp:Panel ID="pnlThankYouMessage" runat="server" CssClass="panel" Visible="False">

          Thank you. Your message has been sent.

and this in my aspx.vb code:

Protected Sub SendEmail_Click(sender As Object, e As System.EventArgs)

        Dim user_name As String = Request.Form("user_name")

        pnlFormFields.Visible = False
        pnlThankYouMessage.Visible = True

    End Sub
How would I amend this ' Thank you. Your message has been sent' to ' Thank you + name. Your message has been sent', please?

Many thanks