asp.net - Troubles using .net ScriptManager for Ajax -

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i'm trying use scriptmanager in .net visual web developer 2010, every time run website, error message appears:

could not load file or assembly 'fsharp.core, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a' or 1 of dependencies. o sistema não pode encontrar o arquivo especificado. (system couldn't find specifyed file). line 7:  </asp:content>   line 8: <asp:content id="content2" contentplaceholderid="maincontent" runat="server">  line 9:      <asp:scriptmanager id="scriptmanager1" runat="server"/>  line 10:     <div> line 11:     <ajaxtoolkit:accordion id="accordion1" selectedindex = "0"  runat="server" headercssclass="accordionheader" hheaderselectedcssclass="accordionheaderselected" contentcssclass="accordioncontent" autosize="none" fadetransitions="true" transitionduration="250" framespersecond="40" requireopenedpane="false" suppressheaderpostbacks="true">

i've instaled ms-f# tool expecting fsharp.core file copyed , solve problem, nothing changed.

thanks.

you cannot register scriptmanager in contentpage of masterpage. should register in masterpage , use scriptmanagerproxy in contentpages:

<asp:scriptmanagerproxy id="scriptmanagerproxy1" runat="server"></asp:scriptmanagerproxy>

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