how to call a function that created in DLL file to when clicked Button in c#? -

i created function insert values database in dll file. how call function clicking button? dll class name dbconnection

code

private void metrobutton2_click(object sender, eventargs e) {     string connstr = "data source=desktop-qpc780f;initial catalog=db_evernote;integrated security=true";     dbconnection.dbconnection db = new dbconnection.dbconnection(connstr); } 

add reference dll have created.

in button click event, create object class dbconnection dbconnection = new dbconnection(connectionstring)

call method using object dbconnection.insertdata()