Server Error in '/' Application.

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Line 62: 	long i, ii;
Line 63: 	String Desc = "";
Line 64: 	String DescFile = Server.MapPath("Descriptions/" + Trim(ProductId) + "_" + Trim(Session["LangId"]) + ".desc");
Line 65: 	Desc = Trim(ReadFromFile(DescFile));
Line 66: 	return Desc;

[PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.]
   System.IO.PathHelper.GetFullPathName() +765
   System.IO.Path.LegacyNormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths) +1364
   System.IO.Path.GetFullPathInternal(String path) +135
   System.Security.Util.StringExpressionSet.CanonicalizePath(String path, Boolean needFullPath) +38
   System.Security.Util.StringExpressionSet.CreateListFromExpressions(String[] str, Boolean needFullPath) +321
   System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList) +161
   System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path) +93
   System.Web.InternalSecurityPermissions.PathDiscovery(String path) +43
   System.Web.HttpRequest.MapPath(VirtualPath virtualPath, VirtualPath baseVirtualDir, Boolean allowCrossAppMapping) +274
   System.Web.HttpServerUtility.MapPath(String path) +96
   ASP.viewshopproduct_aspx.GetProductDescription(Int64 ProductId) in c:\eshopkey\ASP.Net\Shops\nicofilimon\products.incx:64
   ASP.viewshopproduct_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\eshopkey\ASP.Net\Shops\nicofilimon\ViewShopProduct.aspx:428
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4823