Run JavaScript from C# ASP.NET -

i'm trying run javascript function code behind in c#. looked @ many resourses on internet far no luck. not work simple sample code have:

code behind:

  protected void button2_click(object sender, eventargs e)   {        scriptmanager.registerstartupscript(this,gettype(),"a","a();", true);   } 

in aspx file:

 <script type="text/javascript">          function a()          {              var = 0;           }   </script> 

when run :

0x800a1391 - javascript runtime error: 'a' undefined

note :

also tried :

• scriptmanager.registerstartupscript(this,gettype(),"a","a()", true);
• scriptmanager.registerstartupscript(this,gettype(),"a","a", true);

still getting same error.

note future reader: trick use asp update panel. did not found single source point important fact.

• use scriptmanager.registerstartupscript anywhere long inside updatepanel

now tell a() javascript function :

scriptmanager.registerstartupscript(this,gettype(),"a","javascript:a();", true);