How to Make Searchble Drop-Down ?
Means i Click in DropDown Then Open The Drop-Down & In This DropDown There Is Small Textbox in Which i Search The Value For DropDown

i use select2 or select2bs4 class but when i use then form-control css it automatic remove and vise versa. at a time only one css can be work either select2bs4 or form-control

so please suggest a way in i use proper formatting for my drop-down
i use drop-down in my asp .net web form[C#]