500 error in MVC4 project

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We are getting a 500 error. please help me
See below:

XML

HTTP/1.1 500 Internal Server Error
Cache-Control: private
Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Thu, 21 Aug 2014 09:19:44 GMT
Content-Length: 6046

<!DOCTYPE html>
<html>
    <head>
        <title>A potentially dangerous Request.Form value was detected from the client (DATA=&quot;&lt;?xml version=&quot;1.0&quot;?...&quot;).</title>
        <meta name="viewport" content="width=device-width" />
        <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:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
         .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; }
         @media screen and (max-width: 639px) {
          pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }
         }
         @media screen and (max-width: 479px) {
          pre { width: 280px; }
         }
        </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 (DATA=&quot;&lt;?xml version=&quot;1.0&quot;?...&quot;).</i> </h2></span>

            <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">

            <b> Description: </b>ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.
            <br><br>

            <b> Exception Details: </b>System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (DATA=&quot;&lt;?xml version=&quot;1.0&quot;?...&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 (DATA=&quot;&lt;?xml version=&quot;1.0&quot;?...&quot;).]
   System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +12604337
   System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection) +132
   System.Web.HttpRequest.get_HasForm() +12607186
   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +146
   System.Web.UI.Page.DeterminePostBackMode() +129
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12573463
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12572973
   System.Web.UI.Page.ProcessRequest() +119
   System.Web.UI.Page.ProcessRequest(HttpContext context) +99
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +165
</pre></code>

                  </td>
               </tr>
            </table>

            <br>

            <hr width=100% size=1 color=silver>

            <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17929

            </font>

    </body>
</html>
<!--
[HttpRequestValidationException]: A potentially dangerous Request.Form value was detected from the client (DATA=&quot;&lt;?xml version=&quot;1.0&quot;?...&quot;).
   at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection)
   at System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection)
   at System.Web.HttpRequest.get_HasForm()
   at System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull)
   at System.Web.UI.Page.DeterminePostBackMode()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
--><!--
This error page might contain sensitive information because ASP.NET is configured to show verbose error messages using &lt;customErrors mode="Off"/&gt;. Consider using &lt;customErrors mode="On"/&gt; or &lt;customErrors mode="RemoteOnly"/&gt; in production environments.-->

Posted 21-Aug-14 0:27am

soumyaraj

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[no name] 21-Aug-14 6:56am

where is your server side code? Please post that.
Thank you

soumyaraj 21-Aug-14 7:46am

I changed the validateRequest="false" in page directive and also changes made in webconfig file as follows
add key="ClientValidationEnabled" value="true"

when I look in to the event viewer the error shows like below
"Event code: 3003, Event message: "A validation error has occurred."

[no name] 25-Aug-14 0:22am

Yes right as Nathan stated you need to post the server side action method where after debugging ou are getting this 500 internal server error.

Nathan Minier 21-Aug-14 8:28am

Error 500 is a server-side code error. Without seeing any code from your controller, there's not much anyone can tell you.

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David Lee 145 · Answer 1 · 2014-08-22T08:35:00

I think that this error is caused by submitting input value with html tags.

In your controller, you can use ValidationInputAttribute on your action.

C#

[HttpPost]
[ValidateInput(false)]
public ActionResult Index(string text)
{
    return View();
}

In your model, you can use AllowHtmlAttribute on your property.

C#

public class Model
{
    [AllowHtml]
    public string Text { get; set; }

}