https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12501879#M2528 <P>Hello!</P><P>&nbsp;</P><P>In Civil3D it is possible to add XData to objects, but is it also possible to add it to the project?</P><P>I tried to use document.UserData, but the data is gone after the session is closed...</P><P>&nbsp;</P><P>Thanks in advance!</P><P>&nbsp;</P> Wed, 17 Jan 2024 13:37:29 GMT melanie_ernstLF68Z 2024-01-17T13:37:29Z https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12501879#M2528 <P>Hello!</P><P>&nbsp;</P><P>In Civil3D it is possible to add XData to objects, but is it also possible to add it to the project?</P><P>I tried to use document.UserData, but the data is gone after the session is closed...</P><P>&nbsp;</P><P>Thanks in advance!</P><P>&nbsp;</P> Wed, 17 Jan 2024 13:37:29 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12501879#M2528 melanie_ernstLF68Z 2024-01-17T13:37:29Z https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12502279#M2529 <P>As&nbsp; <a href="https://forums.autodesk.com/t5/user/viewprofilepage/user-id/1633394">@hippe013</a>&nbsp; says&nbsp;</P><P><SPAN>You may need to post more of your code than what you have posted. And explain what your end goal is.&nbsp;</SPAN></P> Wed, 17 Jan 2024 16:14:42 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12502279#M2529 hosneyalaa 2024-01-17T16:14:42Z https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12504968#M2530 <P>You can add XData to a Layer. You can use Layer "0", it is available in every drawing and nobody can accidentally purge it.</P><P>&nbsp;</P> Thu, 18 Jan 2024 06:27:36 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/attach-xdata-to-project/m-p/12504968#M2530 Anton_Huizinga 2024-01-18T06:27:36Z