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Q: 

Microsoft JScript runtime error: Object expected when asp.net text_TextChanged?

I have textbox for Date in update panel and this text box has TextChanged method. I am getting JS error when field is empty

    <asp:TextBox ID="txt22_2" runat="server" CssClass="TextBox SmallText" 
AutoPostBack="true"   ></asp:TextBox>
<asp:ImageButton ID="img22_2" runat="server" ImageAlign="Middle" 
style="margin-left:-5px" ImageUrl="~/Images/Calendar_scheduleHS.png" /><br />

alt text

How to disable this JS error?

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