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Set List Column Index in SharePoint using CSOM

The example in this topic show how to use CSOM to Set List Column Index 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.

How to run CSOM code in SharePoint?

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.

create console application using Visual Studio

Now your program.cs file will open. Copy the code in main function.
Once you are done with your code, just hit F5 or Run the application.

using Microsoft.SharePoint.Client;
using System.Linq;
// Adding an index to a column increases performance when you use filters.
// You can add indexes on up to 20 columns on a list or library.
// It's recommended you add indexes to only to the most commonly used columns.
// Indexes add overhead to the data.
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");
// Get field from list using internal name or display name
Field oField = targetList.Fields.GetByInternalNameOrTitle("Column Name");
oField.Indexed = true;
oField.Update();
clientcontext.ExecuteQuery();
}

Similar examples using different APIs:

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

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