update linq to sql values with select new keyword

How to update linq to sql values with select new keyword with anonymous types because I am using var keyword with select new query I need in in this but it returns an error like this

Compiler Error Message: CS0200: Property or indexer 'AnonymousType#1.Code' cannot be assigned to -- it is read only

This is my code:

var ProjectView12 = (from x in db.Projects
select new 
{
    add = db.Locations.Where(y = > y.ID == x.RegionID).FirstOrDefault().Name,
    Province = db.Locations.Where(y = > y.ID == x.ProvinceID).FirstOrDefault().Name,
    District = db.Locations.Where(y = > y.ID == x.DistrictID).FirstOrDefault().Name,
    Code = x.Code,
    Name = x.Name,
    ProjectIdentificationDate = db.Milestones.Where(y = > y.ProjectID == x.ID && y.StageID == 1 && y.ComponentID == 1 && y.ModuleID == 1).FirstOrDefault().Date.ToString(),
    ProjectLat = Convert.ToDecimal(x.Lat),
    ProjectLong = Convert.ToDecimal(x.Lon),
    Remarks = db.Milestones.Where(y = > y.ProjectID == x.ID && y.StageID == 1 && y.ComponentID == 1 && y.ModuleID == 1).FirstOrDefault().Remarks.ToString(),
}).ToList();

foreach(var item in ProjectView12) 
{
    item.Code = txtSubProjectCode.Text;
    item.Name = txtSubProjectName.Text;
    item.ProjectLat = Convert.ToDecimal(txtLatitude.Text);
    item.ProjectLong = Convert.ToDecimal(txtLongitude.Text);
    item.ProjectIdentificationDate = txtDate.Text;
    item.Remarks = txtRemarks.Text;
} //    txtLocation.Text = item.Region + ">" + item.Province + ">" + item.District;

try 
{
    db.SubmitChanges();
}
catch (Exception ex) 
{
    throw ex;
}