title: Trying to add existing site column to the custom list using Visual Studio 2017 | (Sharepoint) [Microsoft.Sharepoint.Client]
body: <p>I am building a code where I'm putting some data to be inserted in SharePoint online, but it can't recognized the "Product" item which is in the custom column area.
  I want to build a code that will add the existing site column (custom column) to the "Product List" (the main list).</p>
  
  <p>The only right thing to do for now is to manually add the existing custom column to my custom list.</p>
  
  <pre><code>        List lst = web.Lists.GetByTitle("Product List");
          ListItemCreationInformation itmCreationInfo = new ListItemCreationInformation();
          ListItem newItem = lst.AddItem(itmCreationInfo);
          newItem["Title"] = "This is a title! Yey!";
          newItem["Product"] = "Ultimate Gaming PC with gaming console";
          newItem.Update();
          ctx.ExecuteQuery();
          Console.WriteLine("All tasks completed.  Press any key to close...");
          Console.ReadLine();
  </code></pre>
  
  <p>I expect the output to be like the "Product" has been automatically add to the column of my main list.</p>