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Add Group To List in SharePoint using CSOM

The example in this topic show how to use CSOM to Remove Groups Permissions From List 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"))
{
// clientcontext.Web.Lists.GetById - This option also can be used to get the list using List GUID
// This value is NOT List internal name
List targetList = clientContext.Web.Lists.GetByTitle("List Name");
// Load the list property(HasUniqueRoleAssignments)
clientContext.Load(targetList, target => target.HasUniqueRoleAssignments);
clientContext.ExecuteQuery();
if (targetList.HasUniqueRoleAssignments)
{
// Write group name to be added in the list
Group group = clientContext.Web.SiteGroups.GetByName("test Owners");
RoleDefinitionBindingCollection roleDefCollection = new RoleDefinitionBindingCollection(clientContext);
// Set the permission level of the group for this particular list
RoleDefinition readDef = clientContext.Web.RoleDefinitions.GetByName("Read");
roleDefCollection.Add(readDef);
Principal userGroup = group;
RoleAssignment roleAssign = targetList.RoleAssignments.Add(userGroup, roleDefCollection);
clientContext.Load(roleAssign);
roleAssign.Update();
clientContext.ExecuteQuery();
}
}

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

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