I installed this package for umbraco https://our.umbraco.org/projects/backoffice-extensions/chosen-multi-select-menu/

And I am trying to update the prevalue for the plugin. I see it is stored in the cmsDataTypePreValues tables with column name "values" and the "alias" value is items.

The prevalue is stored as a json string. In my code I already have the json string created, which I will use to update the current value.

var tagObj = Services.DataTypeService.GetDataTypeDefinitionById(datatypeId); var tagObjPrevalue = Services.DataTypeService.GetPreValuesByDataTypeId(tagObj.Id);

I can get the current prevalue through the tagObjPrevalue object.

How do I set the new json string as the prevalue for the datatype?

I know once it is set, I can do something like Services.DataTypeService.Save(tagObj);

and update the datatype

Any help?