RegisterStartupScript from code behind not working when Update Panel is used

Question

I have created a radiobutton list followed by one button  I can select one of the item from the radiobutton list and then click the button to execute something  And I want the page to pop up a window if the button is clicked without selecting any of the options from the radiobutton list  My codebehide is like this       protected void ButtonPP Click object sender  EventArgs e                if  radioBtnPP SelectedIndex  lt  0                        String csname1    PopupScript               Type cstype   this GetType                    Get a ClientScriptManager reference from the Page class              ClientScriptManager cs   Page ClientScript                  Check to see if the startup script is already registered              if   cs IsStartupScriptRegistered cstype  csname1                                 StringBuilder cstext1   new StringBuilder                    cstext1 Append   lt script type text javascript gt  alert  Please Select Criteria     lt                      cstext1 Append  script gt                      cs RegisterStartupScript cstype  csname1  cstext1 ToString                                    and my html part is        lt asp RadioButtonList class   radioBtn  ID  radioBtnACO  runat  server  gt              lt asp ListItem Text  All Dim    gt              lt asp ListItem Text  Select Dim    gt       lt  asp RadioButtonList gt       lt asp Button id   ButtonPP  class   buttonRight  runat  server  Text  Run PP  OnClick  ButtonPP Click    gt    This works fine  However  now I don t want to refresh the whole page when i click the button  so I use updatepanel  And I changed my html code to the following        lt asp ScriptManager ID  ScriptManager1  runat  server  gt       lt  asp ScriptManager gt       lt asp UpdatePanel ID  ControlUpdatePanel  runat  server  Visible  True  gt           lt ContentTemplate gt                lt asp RadioButtonList class   radioBtn  ID  radioBtnACO  runat  server  gt                  lt asp ListItem Text  All Dim    gt                  lt asp ListItem Text  Select Dim    gt              lt  asp RadioButtonList gt              lt asp Button id   ButtonPP  class   buttonRight  runat  server  Text  Run PP  OnClick  ButtonPP Click    gt           lt  ContentTemplate gt      lt  asp UpdatePanel gt      But now my code doesn t work anymore    If I don t select any option from the radiobutton list and just click the button  no window would pop up     I am sure my codebehind is still executed but seems like it just doesn t passed to my  aspx page      Anyone please help me out  I don t know what to do now    Millions of thanks

User · Accepted Answer

You need to use ScriptManager RegisterStartupScript for Ajax   protected void ButtonPP Click object sender  EventArgs e        if  radioBtnACO SelectedIndex  lt  0                string csname1    PopupScript            var cstext1   new StringBuilder            cstext1 Append  alert  Please Select Criteria                ScriptManager RegisterStartupScript this  GetType    csname1              cstext1 ToString    true

[asp.net] RegisterStartupScript from code behind not working when Update Panel is used

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