How to make a dropdownlist from a seed model (populated table) and pass selected value to a string type variable in another model

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MVC

data

Binding

DropDownList

How to make a dropdownlist from a seed model (populated table) and pass selected value to a string type variable in another model?
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class team {string teamID; string Name_team;} //model
*************************
//seed in configuration file
*************************
new ListTeam>
           {new Team{teamID="Architect";, Name_team="Architect"},
           new Team{teamID="PM";, Name_team="Project_Management"}.ForEach(i => context.DBTeams.AddOrUpdate(i));
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class User{                          //model
string name {get;set;}
string team_of_user{get;set;}
}
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class mainModel                           //model
{[key] string mm {get;set;}
User usr=new User();
Team tm=new Team();
}
------
VIEW
@Html.DropDownListFor(m=>m.usr.team_of_user, new SelectList(...??));//what do i write here

How to make a drop down here which is populated from TeamDB (Database context),
and whose selected value must pass to the other model..?