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Add Column To Site Content Type in SharePoint using CSOM

The example in this topic show how to use CSOM to Add Column To Site Content Type in SharePoint

Please follow the steps below to execute the code in Visual Studio using Console Application. You can customize the solution according to your requirements.
Check the article to Connect to SharePoint context using CSOM. This is very helpful if you are doing any programming in CSOM.
Don't forget to use the assemblies as mentioned in the code.

Open your Visual Studio.
From the template, select Console Application as shown in the screenshot
Select the .Net Framework version from the top drop-down as well. You can also change the .Net Framework after creating the solution.
Enter Project Name, Location and Solution Name and click on OK.

using Microsoft.SharePoint.Client;
using System.Linq;
using (ClientContext clientContext = new ClientContext("http://MyServer/sites/MySiteCollection"))
{
// Get all the content types from current site
ContentTypeCollection oContentTypeCollection = clientcontext.Web.ContentTypes;
// Load content type collection
clientcontext.Load(oContentTypeCollection);
clientcontext.ExecuteQuery();
// Give content type name over here
ContentType targetContentType = (from contentType in oContentTypeCollection where contentType.Name == "Content Type Name" select contentType).FirstOrDefault();
clientcontext.Load(targetContentType);
clientcontext.ExecuteQuery();
Field targetField = clientcontext.Web.AvailableFields.GetByInternalNameOrTitle("Column Name");
FieldLinkCreationInformation fldLink = new FieldLinkCreationInformation();
fldLink.Field = targetField;
// If uou set this to "true", the column getting added to the content type will be added as "required" field
fldLink.Field.Required = false;
// If you set this to "true", the column getting added to the content type will be added as "hidden" field
fldLink.Field.Hidden = false;
targetContentType.FieldLinks.Add(fldLink);
targetContentType.Update(false);
clientcontext.ExecuteQuery();
}

Thank you for reading this article. This code was tested in SharePoint 2013

Page URL:

Name:

Name is a mandatory field

Email:

Email is a mandatory field
Email format is not corrent

Suggestion:

Suggestion is a mandatory field