Error in C# code SQL server

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C#

SQL-Server

SQL-Server-2008

, +

I have used this code to get the number of rows in another dataset.

DS_product temp = new DS_product();
                foreach (DS_product.ProductsRow product in dS_product1.Tables[0].Rows)
                {
                    if (product[1].ToString() == txt_barcode.ToString())
                    {
                        temp.Tables[0].ImportRow(product);
                    }
                }

But when i use this code to get the number of rows i still get none.

if (temp.Tables[0].Rows.Count == 0)

It always says 0.