title: Entity Framework code first add constraint for positive numbers
body: <p>I need to add constraint only for positive number (0-...) and restrict numbers as (...-1). </p>
  
  <pre><code>CreateTable(
     "dbo.Drinks",
     c =&gt; new
     {
         Id = c.Int(nullable: false, identity: true),
         Name = c.String(),
         ImageUrl = c.String(),
         Price = c.Int(nullable: false),
         Count = c.Int(nullable: false)
     })
     .PrimaryKey(t =&gt; t.Id);
     //.Constraint ???
  </code></pre>
  
  <p>Something like 'unsigned' in MS SQL.
  Thank you.</p>