Select List in Linq

Question

I have multiple select statements that fetch result as list and I need to add this list finally to bind to a dropdown.Currently this is what I am doing..

 public void load()
{
    try
    {

        using (DataContext db = new DataContext())
        {
            var cm = (from c in db.COMPANY_MASTERs
                      select c).FirstOrDefault();

            if (Convert.ToBoolean(cm.PLANT))
            {
                var Div = (from vp in db.PLANT
                           select new
                           {
                               ID = vp.PLANT_ID,
                               NAME = vp.PLANT_NAME
                           }).ToList();
            }
            if (Convert.ToBoolean(cm.ANIMAL))
            {
                var Dep = (from vp in db.ANIMAL
                           select new
                           {
                               ID = vp.ANIMAL_ID,
                               NAME = vp.ANIMAL_NAME
                           }).ToList();
            }
            //this is what I am trying to do but cant,since the variables are nested                inside if.

              Div.AddRange(Dep);
            ddl.DataTextField = "NAME";
            ddl.DataValueField = "ID";
            ddl.DataSource = Div;
            ddl.DataBind();
}

This is my question,

1.How can I overcome this anonymous type error and bind the added list to dropdown.

Thanks

Answer 1

When you select, create a new instance of your Variable type, not an anonymous select :

var Div = (from vp in db.PLANT
           select new Variable()
           {
               ID = vp.PLANT_ID,
               GENDER = vp.PLANT_NAME
           }).ToList();

Then do the same with your Dep variable :

var Dep = (from vp in db.ANIMAL
           select new
           {
               ID = vp.ANIMAL_ID,
               GENDER = vp.ANIMAL_NAME
           }).ToList();

And you'll be able to AddRange()


Edit : Your variable need to be in the same scope to be used together.. You should declare them (strongly typed) up top of your function. (thanks andrii.litvinov)

List<Variable> Div;
List<Variable> Dep;

Answer 2

You can initialize lstVar and add the contents of the other two lists using successive foreach loops

Answer 3

In addition to Gabriel GM answer you should declare variables before first if.