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copied!<p>Try this trick</p> <pre><code>public string[] GetVideoTitles(string prefixText) { try { ...Your code... foreach (DataRow dr in dt.Rows) { items.SetValue(dr["videotitle"].ToString(), i); Debug.Write(dr["videotitle"].ToString()); i++; } ...Your code... } catch(Exception) { Debug.Assert(false); } } </code></pre> <p>This way you first locate if somthing stop running on webservice method. Also use the DebugView from sysinternals to check live the data you get from Debug.write()</p> <p><a href="http://technet.microsoft.com/en-us/sysinternals/bb896647.aspx" rel="nofollow noreferrer">Debug View</a></p> <p>Hope this 2 thinks help you locate the bug.</p> <p>-- Found this on asp.net forums-- <a href="http://forums.asp.net/t/1123944.aspx" rel="nofollow noreferrer">http://forums.asp.net/t/1123944.aspx</a></p> <p>In most cases where the WebService method does not get calls becasue the WebMethod Signature does not match with the AutoComplete Extender signature. The Method signature needs to be:</p> <p><strong>string[] WSMethodName(string prefixText, int count)</strong></p> <p>You can have different method name but the parameter names and return type needs to be exact match even in case. </p> <p>Reading this page <a href="http://www.vishwamohan.com/post/2007/05/07/AJAX-Error-Sys-is-undefined.aspx" rel="nofollow noreferrer">http://www.vishwamohan.com/post/2007/05/07/AJAX-Error-Sys-is-undefined.aspx</a></p> <p>and this page <a href="http://blogs.imeta.co.uk/TAxworthy/archive/2009/01/15/569.aspx" rel="nofollow noreferrer">http://blogs.imeta.co.uk/TAxworthy/archive/2009/01/15/569.aspx</a> Found that the sys problem can solve that way....</p> <p>The most important line was:</p> <p><strong>allowDefinition="MachineToApplication"</strong> </p> <pre><code><section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" /> </code></pre> <p>When compared to the application’s web.config, the last section was missing. When this line was amended, the javascript error was fixed, and the AJAX controls worked correctly again.</p>

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