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I have the following situation: I have a textbox inside an ajax updatepanel. Wherever the user types in the textbox I must display a message (different message that depends on the user typed data). <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always"> <ContentTemplate> <asp:TextBox ID="txtMyTexbox" runat="server" Width="500px" OnTextChanged="txtMyTexbox_TextChanged" AutoPostBack="true"></asp:TextBox> <br /> <asp:Label ID="lblMessage" runat="server" CssClass="errorMessage" Visible="false">Hello World</asp:Label> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="txtMyTexbox" /> </Triggers> </asp:UpdatePanel> In server side I have written the following at page load ScriptManager.GetCurrent(this).RegisterAsyncPostBackControl(txtMyTexbox); and the method like this protected void txtMyTexbox_TextChanged(object sender, EventArgs e) { if (.....) { lblMessage.Visible = false; } else { lblMessage.Visible = true; } } My problem now is that: when the user types in the textbox it doesn't cause OnTextChanged event. Am I missing something?

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