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[Solved] Spell checker fails with .NET 4.0

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This is a migrated thread and some comments may be shown as answers.
Steve asked on 30 Mar 2010, 10:04 PM
I have a basic page with Telerik Editor on it, with spell checking enabled. The page worked fine in .NET 3.5 - spell checking and all, but since migrating the code to .NET 4.0 RC the spell checking functionality fails with the following error:

A potentially dangerous Request.Form value was detected from the client (CommandArgument="<br>").

What do I have to do to make this with with .NET 4.0?

Thanks

Full error:
    
            <html> 
        
                <head> 
        
                    <title>A potentially dangerous Request.Form value was detected from the client (CommandArgument=&quot;&lt;br&gt;&quot;).</title> 
        
                    <style> 
        
                     body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}  
        
                     p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px} 
        
                     b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px} 
        
                     H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red } 
        
                     H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon } 
        
                     pre {font-family:"Lucida Console";font-size: .9em} 
        
                     .marker {font-weight: bold; color: black;text-decoration: none;} 
        
                     .version {color: gray;} 
        
                     .error {margin-bottom: 10px;} 
        
                     .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; } 
        
                    </style> 
        
                </head> 
        
                <body bgcolor="white"> 
        
                        <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1> 
        
                        <h2> <i>A potentially dangerous Request.Form value was detected from the client (CommandArgument=&quot;&lt;br&gt;&quot;).</i> </h2></span> 
        
                        <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif "> 
        
                        <b> Description: </b>Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted.  This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack.  To allow pages to override application request validation settings, set the requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". Example: &lt;httpRuntime requestValidationMode="2.0" /&gt;. After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the &lt;pages&gt; configuration section.  However, it is strongly recommended that your application explicitly check all inputs in this case.  For more information, see http://go.microsoft.com/fwlink/?LinkId=153133. 
        
                        <br><br> 
        
                        <b> Exception Details: </b>System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (CommandArgument=&quot;&lt;br&gt;&quot;).<br><br> 
        
                        <b>Source Error:</b> <br><br> 
        
                        <table width=100% bgcolor="#ffffcc"> 
        
                           <tr> 
        
                              <td> 
        
                                  <code> 
        
            An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code> 
        
                              </td> 
        
                           </tr> 
        
                        </table> 
        
                        <br> 
        
                        <b>Stack Trace:</b> <br><br> 
        
                        <table width=100% bgcolor="#ffffcc"> 
        
                           <tr> 
        
                              <td> 
        
                                  <code><pre> 
        
            [HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (CommandArgument=&quot;&lt;br&gt;&quot;).] 
        
               System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +8809720 
        
               System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, RequestValidationSource requestCollection) +122 
        
               System.Web.HttpRequest.get_Form() +114 
        
               Telerik.Web.UI.SpellCheckHandler.ProcessRequest(HttpContext context) +187 
        
               System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100 
        
               System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +75 
        
            </pre></code> 
        
                              </td> 
        
                           </tr> 
        
                        </table> 
        
                        <br> 
        
                        <hr width=100% size=1 color=silver> 
        
                        <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30128; ASP.NET Version:4.0.30128.1 
        
                        </font> 
        
                </body> 
        
            </html> 
        
            <!--  
        
            [HttpRequestValidationException]: A potentially dangerous Request.Form value was detected from the client (CommandArgument=&quot;&lt;br&gt;&quot;). 
        
               at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) 
        
               at System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, RequestValidationSource requestCollection) 
        
               at System.Web.HttpRequest.get_Form() 
        
               at Telerik.Web.UI.SpellCheckHandler.ProcessRequest(HttpContext context) 
        
               at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
        
               at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 
        
            -->
[Solved] Spell checker fails with .NET 4.0

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