<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" version="2.0">
  <channel>
    <title>topic Re: Where is ESRI.ArcGIS.Client.Extensibility ? in ArcGIS Viewer for Silverlight Questions</title>
    <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562146#M1508</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;Hi Douglas,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;ESRI.ArcGIS.Client.Extensibility is part of our ArcGIS Extensibility SDK for Silverlight. We are in the process of posting the download for the SDK shortly. &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks,&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Katy&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Wed, 18 Jan 2012 17:00:04 GMT</pubDate>
    <dc:creator>KatherineDalton</dc:creator>
    <dc:date>2012-01-18T17:00:04Z</dc:date>
    <item>
      <title>Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562145#M1507</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;I've just installed the ArcGIS API version 2.4 and downloaded the "TimeSlider" sample from the Silverlight Viewer Samples.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;I get a reference error for ESRI.ArcGIS.Client.Extensibility.&amp;nbsp; All other ArcGIS references resolve.&amp;nbsp; &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Any clues?&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Douglas&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 18 Jan 2012 16:18:32 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562145#M1507</guid>
      <dc:creator>DouglasGennetten</dc:creator>
      <dc:date>2012-01-18T16:18:32Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562146#M1508</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;Hi Douglas,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;ESRI.ArcGIS.Client.Extensibility is part of our ArcGIS Extensibility SDK for Silverlight. We are in the process of posting the download for the SDK shortly. &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks,&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Katy&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 18 Jan 2012 17:00:04 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562146#M1508</guid>
      <dc:creator>KatherineDalton</dc:creator>
      <dc:date>2012-01-18T17:00:04Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562147#M1509</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;You need the Extensibility SDK, but the final version of that has not been released yet.&amp;nbsp; See &lt;/SPAN&gt;&lt;A href="http://forums.arcgis.com/threads/47896-ArcGIS-Viewer-for-Silverlight-1.0-final-now-available!!!?p=164052&amp;amp;viewfull=1#post164052"&gt;this post&lt;/A&gt;&lt;SPAN&gt;.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Mike&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 18 Jan 2012 17:00:35 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562147#M1509</guid>
      <dc:creator>MichaelLacy</dc:creator>
      <dc:date>2012-01-18T17:00:35Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562148#M1510</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE class="jive-quote"&gt;Hi Douglas,&lt;BR /&gt;&lt;BR /&gt;ESRI.ArcGIS.Client.Extensibility is part of our ArcGIS Extensibility SDK for Silverlight. We are in the process of posting the download for the SDK shortly. &lt;BR /&gt;&lt;BR /&gt;Thanks,&lt;BR /&gt;Katy&lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;SPAN&gt; &lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Has it been posted?&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 18 Jan 2012 21:27:51 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562148#M1510</guid>
      <dc:creator>AndreaHemphill</dc:creator>
      <dc:date>2012-01-18T21:27:51Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562149#M1511</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;All,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;FYI, the &lt;/SPAN&gt;&lt;A href="http://resources.arcgis.com/content/arcgis-viewer-silverlight-10-download"&gt;ArcGIS Extensibility SDK for Silverlight&lt;/A&gt;&lt;SPAN&gt; is now available.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks for your patience,&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 18 Jan 2012 22:29:28 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562149#M1511</guid>
      <dc:creator>DerekLaw</dc:creator>
      <dc:date>2012-01-18T22:29:28Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562150#M1512</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE class="jive-quote"&gt;All,&lt;BR /&gt;&lt;BR /&gt;FYI, the &lt;A href="http://resources.arcgis.com/content/arcgis-viewer-silverlight-10-download"&gt;ArcGIS Extensibility SDK for Silverlight&lt;/A&gt; is now available.&lt;BR /&gt;&lt;BR /&gt;Thanks for your patience,&lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;SPAN&gt;What platform this SDK supports? I got an error of "The version of this file is not compatible with the version of Windows you're running." when I tried to install it. My system is Windows 7 Professional. Thanks.&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 13 Feb 2012 19:01:19 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562150#M1512</guid>
      <dc:creator>JianChen</dc:creator>
      <dc:date>2012-02-13T19:01:19Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562151#M1513</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;BTW, what's the difference between ArcGIS Extensibility SDK for Silverlight and ArcGIS API for Silverlight? I already installed the later on my machine.&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 13 Feb 2012 19:34:36 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562151#M1513</guid>
      <dc:creator>JianChen</dc:creator>
      <dc:date>2012-02-13T19:34:36Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562152#M1514</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;Jian,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Which version of the ArcGIS Extensibility SDK for Silverlight did you try to install? There is a version for 64-bit and 32-bit operating systems.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;As for your second question, the ArcGIS API for Silverlight is the API upon which the ArcGIS Viewer for Silverlight is built. The ArcGIS Extensibility SDK for Silverlight is specific to the ArcGIS Viewer for Silverlight and ArcGIS for SharePoint and provides an API specifically for writing add-ins that allows you to access the map and selected layer, show user interfaces (UI) in dialog boxes, and store and load configuration data. The ArcGIS Extensibility SDK for Silverlight (and ArcGIS API for Silverlight) are required for developing add-ins.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;&lt;SPAN&gt;See &lt;A href="&amp;lt;/span&amp;gt;&amp;lt;a" target="_blank"&gt;Extending" rel="nofollow" target="_blank"&amp;gt;http://help.arcgis.com/en/webapps/silverlightviewer/help/index.html#/Extending_the_ArcGIS_Viewer_for_Silverlight/017700000006000000/]Extending&lt;/A&gt;&lt;SPAN&gt; the ArcGIS Viewer for Silverlight for more info.&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Hope that helps,&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Katy&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 14 Feb 2012 15:55:25 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562152#M1514</guid>
      <dc:creator>KatherineDalton</dc:creator>
      <dc:date>2012-02-14T15:55:25Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562153#M1515</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE class="jive-quote"&gt;Jian,&lt;BR /&gt;&lt;BR /&gt;Which version of the ArcGIS Extensibility SDK for Silverlight did you try to install? There is a version for 64-bit and 32-bit operating systems.&lt;BR /&gt;&lt;BR /&gt;As for your second question, the ArcGIS API for Silverlight is the API upon which the ArcGIS Viewer for Silverlight is built. The ArcGIS Extensibility SDK for Silverlight is specific to the ArcGIS Viewer for Silverlight and ArcGIS for SharePoint and provides an API specifically for writing add-ins that allows you to access the map and selected layer, show user interfaces (UI) in dialog boxes, and store and load configuration data. The ArcGIS Extensibility SDK for Silverlight (and ArcGIS API for Silverlight) are required for developing add-ins.&lt;BR /&gt;&lt;BR /&gt;See &lt;A href="http://help.arcgis.com/en/webapps/silverlightviewer/help/index.html#/Extending_the_ArcGIS_Viewer_for_Silverlight/017700000006000000/" target="_blank"&gt;Extending the ArcGIS Viewer for Silverlight&lt;/A&gt; for more info.&lt;BR /&gt;&lt;BR /&gt;Hope that helps,&lt;BR /&gt;Katy&lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks Katy! &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;I try to install a 64-bit version of ArcGIS Extensibility SDk for Silverlight. But the problem is that I couldn't find a 64-bit one. &lt;/SPAN&gt;&lt;A href="http://resources.arcgis.com/content/arcgis-viewer-silverlight-10-download"&gt;&lt;STRONG style="font-style: italic;"&gt;The download link&lt;/STRONG&gt;&lt;/A&gt;&lt;SPAN&gt; has 32-bit and 64-bit versions of ArcGIS viewer for Silverlight but only one file for Extensibility SDK there and without information of compatibility. Finally I figured out it is a 32-bit version for Windows XP SP2. &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;So could you please give me a link I can download the 64-bit version of ArcGIS Extensibility SDK for Silverlight? Thanks!&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 15 Feb 2012 13:42:28 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562153#M1515</guid>
      <dc:creator>JianChen</dc:creator>
      <dc:date>2012-02-15T13:42:28Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562154#M1516</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;Sorry Jian,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;I misspoke about the versions of the SDK install. We only have 32-bit and 64-bit versions for the Application, not the SDK. I'll look in to your issue a bit more and we'll get back to you.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Katy&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 15 Feb 2012 14:10:53 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562154#M1516</guid>
      <dc:creator>KatherineDalton</dc:creator>
      <dc:date>2012-02-15T14:10:53Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562155#M1517</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;There is only one Extensibility setup because it installs the .NET assemblies in the 32 bit Program Files folder. The assemblies are integrated into Visual Studio, Expression Blend or Web Developer Express which are 32 bit programs.&amp;nbsp; The assemblies themselves are built with configuration �??AnyCPU�?�, which means they run 32 bit on a 32 bit Operating System and 64 bit on a 64 bit Operating System.&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 15 Feb 2012 14:53:38 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562155#M1517</guid>
      <dc:creator>WilburHughes</dc:creator>
      <dc:date>2012-02-15T14:53:38Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562156#M1518</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE class="jive-quote"&gt;There is only one Extensibility setup because it installs the .NET assemblies in the 32 bit Program Files folder. The assemblies are integrated into Visual Studio, Expression Blend or Web Developer Express which are 32 bit programs.&amp;nbsp; The assemblies themselves are built with configuration �??AnyCPU�?�, which means they run 32 bit on a 32 bit Operating System and 64 bit on a 64 bit Operating System.&lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;SPAN&gt; Thanks Willbur!&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;This should work for both 32-bit and 64-bit system. As you pointed out in &lt;/SPAN&gt;&lt;STRONG style="font-style: italic;"&gt;&lt;A href="http://forums.arcgis.com/threads/49999-ArcGIS-Extensibility-SDK-for-Silverlight-installation-issue"&gt;another post&lt;/A&gt;&lt;/STRONG&gt;&lt;SPAN&gt;, I got this problem just because the file I download is corrupt (though it is not easy to figure this out because the error info I got is kind of misleading --pointing to compatibility; I even tried re-downloading it the other day and still had the same issue). Fortunately I tried again today and now it finally works for me.&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 15 Feb 2012 18:14:49 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562156#M1518</guid>
      <dc:creator>JianChen</dc:creator>
      <dc:date>2012-02-15T18:14:49Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562157#M1519</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;I had downloaded an example (Query Tool) which is showing error as &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;'ESRI.ArcGIS.Client.Extensibility.ApplicationUrls' does not contain a definition for 'ProxyUrl' and no extension method 'ProxyUrl' accepting a first argument of type 'ESRI.ArcGIS.Client.Extensibility.ApplicationUrls' could be found (are you missing a using directive or an assembly reference?) C:\Documents and Settings\Administrator\My Documents\Downloads\QueryTool\Source\QueryTool\QueryTool.AddIns\QueryTool.cs&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;I had added the reference to ESRI.ArcGIS.Client.Extensibility already. But no change. &lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Help me to get out of this?&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Abhy&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 02 May 2013 06:15:39 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562157#M1519</guid>
      <dc:creator>AbhijatC</dc:creator>
      <dc:date>2013-05-02T06:15:39Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562158#M1520</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;SPAN&gt;Hi Abhijat,&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;BLOCKQUOTE class="jive-quote"&gt; I had downloaded an example (Query Tool) which is showing error as &lt;BR /&gt;&lt;BR /&gt;'ESRI.ArcGIS.Client.Extensibility.ApplicationUrls' does not contain a definition for 'ProxyUrl' and no extension method 'ProxyUrl' accepting a first argument of type 'ESRI.ArcGIS.Client.Extensibility.ApplicationUrls' could be found (are you missing a using directive or an assembly reference?) C:\Documents and Settings\Administrator\My Documents\Downloads\QueryTool\Source\QueryTool\QueryTool.AddIns\QueryTool.cs&lt;BR /&gt;&lt;BR /&gt;I had added the reference to ESRI.ArcGIS.Client.Extensibility already. But no change. &lt;BR /&gt;&lt;BR /&gt;Help me to get out of this? &lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;SPAN&gt; &lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Are you using the latest version of the ArcGIS Extensibility SDK for Silverlight 3.1?&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;It looks like you're using an older release.&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;You can get it from &lt;/SPAN&gt;&lt;A href="http://www.esri.com/apps/products/download/index.cfm?fuseaction=download.main&amp;amp;downloadid=879"&gt;here&lt;/A&gt;&lt;SPAN&gt;.&lt;/SPAN&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;SPAN&gt;Hope this helps,&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 03 May 2013 15:28:49 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562158#M1520</guid>
      <dc:creator>DerekLaw</dc:creator>
      <dc:date>2013-05-03T15:28:49Z</dc:date>
    </item>
    <item>
      <title>Re: Where is ESRI.ArcGIS.Client.Extensibility ?</title>
      <link>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562159#M1521</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE class="jive-quote"&gt;Hi Abhijat,&lt;BR /&gt;&lt;BR /&gt;&lt;BR /&gt; &lt;BR /&gt;Are you using the latest version of the ArcGIS Extensibility SDK for Silverlight 3.1?&lt;BR /&gt;It looks like you're using an older release.&lt;BR /&gt;You can get it from &lt;A href="http://www.esri.com/apps/products/download/index.cfm?fuseaction=download.main&amp;amp;downloadid=879"&gt;here&lt;/A&gt;.&lt;BR /&gt;&lt;BR /&gt;Hope this helps,&lt;/BLOCKQUOTE&gt;&lt;BR /&gt;&lt;SPAN&gt; &lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;Thanks a ton.&lt;/SPAN&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 18 Oct 2013 10:03:23 GMT</pubDate>
      <guid>https://community.esri.com/t5/arcgis-viewer-for-silverlight-questions/where-is-esri-arcgis-client-extensibility/m-p/562159#M1521</guid>
      <dc:creator>AbhijatC</dc:creator>
      <dc:date>2013-10-18T10:03:23Z</dc:date>
    </item>
  </channel>
</rss>

