How can i customize rendering of a custom field type in sharepoint using server side codes. i searched on the net but i am getting examples with csr technology i.e. JSlink. I want to know that how can i do it in another way ?

I want that my field should have a default value or placeholder when displayes in new form for a list or library.

thank you.

How can I customize rendering of a custom field type in SharePoint using server side code?

I searched on the net but I am getting examples with csr technology i.e. JSLink. I want to know how I can do it in another way.

I want my field to have a default value or placeholder when displayed in new form for a list or library.