How to create a dropdownlist column/field in a newform.aspx with items from another list in SharePoint?

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I would like to create a column/field in a newform.aspx with items from another list in SharePoint. Basically while creating a new item in the list they should see a dropdownlist with items in columns from another list in SharePoint.

NOTE: The new item is been created in an External List, so lookup field is not an option.

List 1:

Contractor (Column)
ABC
CDE
FJG

New Form ASP.NET Code:

<SharePoint:FieldLabel Grid.Column="0" Grid.Row="4" ControlMode="New" FieldName="Contractor" />
<Comment FieldName="Contractor" FieldInternalName="Contractor" FieldType="Text" />
<SharePoint:FormField Grid.Column="1" Grid.Row="4" ControlMode="New" FieldName="Contractor" IncludeDescription="True"/>

Thanks.