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Onchange event for textbox not fiiring inside updatepanel

Posted By:      Posted Date: October 24, 2010    Points: 0   Category :ASP.Net


i am developing the webpage using Visual 2008.In that i have  i am using update panel and displaying  values in the textbox bby using webservices from sql database.I need this thing if  textbox values changes i need to change the backkground color of the text box also, so that user can easily identify which textbox values are changing. like this i  have 5 more text boxes control in the same form .i have tried but i could not  able to get done. i have written javascript code on change event of the text box  it does work.if  u people have any suggestion  kindly inform me . i am using trigger  to update the content panel.for your references i have copied the code.

This is the code i have wrriten in timer tick event

 Protected Sub UpdateTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs)
        'TextBox1.Attributes.Add("OnChange", "check(this);")
        TextBox1.Attributes.Add("onfocus", "check(this);")
        Dim obj As New ex.wb_service

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