When posting and specifying an obj in the args where the member vars of the obj match to the names of form elements

gistfile1.cs

//object
namespace something
{
  public class SomeObj
  {
    public string SomeStr;
  }
}

//view with a form that posts to SomePostedAction
<form>
<input type="text" name="someStr" />
</form>

//put 'some text' in the input

//controller action
public ActionResult SomePostedAction(SomeObj someObj)
{
  //'some text' == someOBj.SomeStr
}