How can I insert in database values from dropdown list based on a relationship between 2 tables? I am using ASP.NET c# Entity framework, Code first

Question

I am not talking about the id of the element in the list, but the id of it from a table if the value is in another table. Eg I have a FullName and an ID in one table and I have the same ID and some other stuff in another table(one to zero or one relationship). I have bound the FullName to a dropdown list control,but when saving,I need to refer to it's ID from the table, not the string value.

Answer 1

If you place something in a drop down list, you can place the ID in the value field and something else as a text, for example :

ddlCategorie.DataTextField = "Texte";
ddlCategorie.DataValueField = "ID_GLOBAL";
ddlCategorie.DataSource = db.GLOBAL.Where(t => t.DATE_FIN > dt).OrderByDescending(t => t.ID_GLOBAL).ToList();
ddlCategorie.DataBind();

As you see, I already placed the reel database value "ID" of the object inside the value field of the drop down list. So I can immediately retrieve is ID by doing :

int i = Convert.ToInt32(ddlCategorie.SelectedValue);