How to assign string value to [DependentObject(TextCollection)]?

Hi Experts,

            I have a custom BO with a dependent field TextCollection.

//Notes

[DependentObject(TextCollection)] node TextCollection;

I have to assign some text for eg.." This is test value" to this TextCollection  from the PDI ( .absl code.).

How do I achieve this?

I tried couple of things like,

TextCollection.ActionCode="04";

TextCollection.Text.GetFirst().LanguageCode ="EN";

TextCollection.Text.GetFirst().TextContent.Text.content = "This is Testing notes from upload";

But this didn't worked. Any suggestions?

Thank you for the Help in advance.

Praveen