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You must call ClientContext.ExecuteQuery() to persist any changes to the server.

When modifying the ListItem object you need to call ClientContext.ExecuteQuery in order to persist the changes to the server.

CheckId SPC019020
TypeName ExecuteQueryAfterModifyingListItemObject
Severity Warning
Type Assembly

Bad Practice

using (var context = new ClientContext("http://yoursite"))
{
    // Assume that the web has a list named "Announcements".
    List announcementsList = context.Web.Lists.GetByTitle("Announcements");

    // Assume there is a list item with ID=1.
    ListItem listItem = announcementsList.GetItemById(1);

    // Write a new value to the Body field of the Announcement item.
    listItem["Body"] = "This is my new value!";
    context.ExecuteQuery();
}


Good Practice
using (var context = new ClientContext("http://yoursite"))
{
    // Assume that the web has a list named "Announcements".
    List announcementsList = context.Web.Lists.GetByTitle("Announcements");

    // Assume there is a list item with ID=1.
    ListItem listItem = announcementsList.GetItemById(1);

    // Write a new value to the Body field of the Announcement item.
    listItem["Body"] = "This is my new value!";

    // Update the listItem object with ListItem.Update() and then call ClientContext.ExecuteQuery()
    listItem.Update();
    context.ExecuteQuery();  
}

To suppress this violation in managed code add the following attribute to the method which contains the instruction (available since SPCAF version v5.2). Learn more about SuppressMessage here.

// Important: Ensure to have #define CODE_ANALYSIS at the beginning of your .cs file
[SuppressMessage("SPCAF.Rules.ManagedCSOM.CSOMCorrectnessGroup", "SPC019020:ExecuteQueryAfterModifyingListItemObject", Justification = "Provide reason for suppression here")]
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