Help with coding Linq Query

I'm trying to fill a gridview using a linq query and a contain statement. I am positive I have a lot more code than I need. I'd love a little help. Right now my error is I can't add ToString on p.DepartmentID.

 var C = (from x in ctx.tblDepartments orderby x.Department select x);
                System.Collections.Generic.List<string> CustomerIdList = new System.Collections.Generic.List<string>();
                List<tblDepartment> bb = new List<tblDepartment>();
                bb = C.ToList();
                foreach (tblDepartment item in bb)
                string CustomerCsvList = string.Join(", ", CustomerIdList.Select(o => o.ToString()).ToArray());
                List<vw_EquipmentType> blist = (from p in ctx.vw_EquipmentType where CustomerIdList.Contains(p.DepartmentID.ToString()) select p).ToList();
                grdView.DataSource = blist;
NickMalloySystems LeadAsked:
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Richard LeeSoftware EnthusiastCommented:
I can reduce your query and still maintain readability to this:

var CustomerIdList = from x in ctx.tblDepartments 
				orderby x.Department 
				select x.DepartmentID;
 grdView.DataSource = (from p in ctx.vw_EquipmentType 
 		where CustomerIdList.Contains(p.DepartmentID.ToString()) 
							select p).ToList();

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A better approach however would be to simply inner join the departments to vw_EquipmentType and get the result.

grdView.DataSource = (from dept in ctx.tblDepartments
join equip in ctx.vw_EquipmentType
	on dept.DepartmentID equals equip.DepartmentID
	select equip).ToList();

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