Server Error in '/Coding & Desgin' Application.(solve this )
<p>A potentially dangerous Request.Path value was detected from the client (&amp;).
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.</p>

<p>Exception Details: <code>System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (&amp;).</code></p>

<p>Source Error:</p>

<blockquote>
  <p>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.</p>
</blockquote>

<p>Stack Trace:</p>

<blockquote>
  <p>[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (&amp;).]
     System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +8884233
     System.Web.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +35
     System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +184</p>
</blockquote>

<p>Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 </p>
