Question

Taking advantage of Linq trying to make a neater update code on the provided DataSet-Based approach :

The Code I’m trying is :

                ListProducts.ForEach( product =>
                {
                    DsProducts.TblProductsRow row = Ds1Products.TblProducts.First( p => p.Name == product.Name);
                    row.Price = Product.Price ;
                });

                Adapter.Update(Ds1Products, "TblProducts"); 

Not sure weather I needed parameters here or not, I haven’t defined any yet.
Cause wanted to use the "Typed" facilities of it.
The Data Adapter is initialized and filled.

Notes :

1. It does not work right now , Gotten Error here : "Sequence contains no matching element"

2. Wanted to Replace the foreach with Linq's Select if possible

   ( Try it to be neat and Linqy as possible )

3. its in SQL CE (Shouldn’t be a problem here on most cases)

Answer 1

This is hopefully what you need:

var productRows = from p in ListProducts
                  join row in Ds1Products.Tables["TblProducts"].AsEnumerable()
                  on p.Name equals row.Field<String>("Name")
                  select new { NewPrice = p.Price, Row = row };
foreach(var productInfo in productRows)
{
    productInfo.Row.SetField<Double>("Price", productInfo.NewPrice);
}

---

Edit: Here’s the strong typed DataSet way(almost identical):

var productRows = from p in ListProducts
                  join row in Ds1Products.TblProduct
                  on p.Name equals row.Name 
                  select new { NewPrice = p.Price, Row = row };
foreach (var productInfo in productRows)
{
    productInfo.Row.Price = productInfo.NewPrice;
}
Adapter.Update(Ds1Products, "TblProducts"); 

By the way, List.ForEach is not Linq, it existed already in .NET 2.0 hence prior to Linq.