Server Error in '/tidy' Application.

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Line 14:             content = c.Request.QueryString["test"].ToString();
Line 15: 
Line 16:         if (c.Request.Form["testo"] != null)
Line 17:             content = c.Request.Form["testo"].ToString();
Line 18: 

[IOException: There is not enough space on the disk.
]
   System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +7724248
   System.IO.FileStream.WriteCore(Byte[] buffer, Int32 offset, Int32 count) +7484255
   System.IO.FileStream.Write(Byte[] array, Int32 offset, Int32 count) +266
   System.Web.TempFile.AddBytes(Byte[] data, Int32 offset, Int32 length) +32
   System.Web.HttpRawUploadedContent.AddBytes(Byte[] data, Int32 offset, Int32 length) +8837757
   System.Web.HttpRequest.GetEntireRawContent() +472
   System.Web.HttpRequest.FillInFormCollection() +105
   System.Web.HttpRequest.get_Form() +68
   cleanHTML.ProcessRequest(HttpContext c) in c:\Produzione\tidy\tidy.ashx:16
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75