c# - MVC Razor Form DropDownListFor objects -

i have dropdown list defined follows:

@html.dropdownlistfor(model => model.properties, new selectlist(model.properties, "propertyid", "propertyname")) 

when submit form, model has null in properties field. doing wrong? dropdown list incorrectly defined?

it's not clear type properties object, looking @ name guess kind of collection.

usually dropdownlist has 1 value. should have in model:

public int propertyid { get; set; } 

and in view:

@html.dropdownlistfor(model => model.propertyid , new selectlist(model.properties, "propertyid", "propertyname")) 

so when post occurs can selected item property.