Creating a non mapped property in an entity (entity framework)

Question

I want to create a custom property on one of my entities mapped from the database, however this property is not mapped to the database, I created the property using partial

Answer 1

This page really helped me. I'll add exactly what I added to my mapping configuration after seeing Kniganapolke's answer.

 public TheObjectName()
   {
       this.HasKey(t => t.ID);
       this.Ignore(t => t.IsProcess); //we don't want EF to worry about this
    }

Thanks everyone, thanks SO!