I am able to change the master page using the below code

var web = ctx.Web;
    var masterPageUrl = String.Format( "{0}/_catalogs/masterpage/filename.master", ctx.Web.ServerRelativeUrl );
    web.MasterUrl = masterPageUrl;
    web.CustomMasterUrl = masterPageUrl;
    ctx.Load( web );

This works fine and it changes the master page to desired file.

But the problem is after doing that i have to manually goto

"site settings" -> "goto the top level settings" -> "master page"

and then check the "Reset all subsites to inherit this site master page setting"

Is there a way to avoid this manual step and achieve this using CSOM?


Try following code.

foreach(Web child in web.Webs) {
    child.AllProperties["__InheritsCustomMasterUrl"] = true;
    child.AllProperties["__InheritsMasterUrl"] = true;

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