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All TextBox controls in ASP.NET UpdatePanel won't accept any input after post-back

Posted By:      Posted Date: November 02, 2010    Points: 0   Category :ASP.Net

 My code behind is VB.NET. I use ASP.NET UpdatePanel like the following. However, after the post-back, all textbox in UpdatePanel won't accept any input, except when I move the mouse over and click on the TextBox.

  • Here's why I use UpdatePanel:

    During the post-back, after inserting data into DB, set all TextBox text property to String.Empty

    After the form is submitted, the Panel pStudent should be refresh , not the entire page

    and the TextBox txtId is set in focus again.

It's very strange that this happened to me today. I used UpdatePanel before many time I never had such problem.

Can anyone show me why  all TextBox controls in UpdatePanel won't accept any input after the post-back even though the textbox is focused , only when you move mouse click in them? 

    <asp:UpdatePanel ID="upPOS" runat="server">
            <asp:Panel ID="pStudent" runat="server" CssClass="InContentInfoLight" 
        DefaultButton="btnSubmit" GroupingText="Cafeteria - POS">
                <br />
                <div class ="divleftcolumn-six">
                    ID Number :
                    <asp:TextBox ID

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