I m facing problem in Update operation,Select operation is completed.

To Perform Update operation-
1)Add Class Products
2) Add a new method called UpdateProducts

below is the Vb code,but i want to work with C# Code
Code:
Public Sub updateProducts(ByVal ProductID As Integer, _
                      ByVal ProductName As String, _
                      ByVal SupplierID As Integer, _
                      ByVal CategoryID As Integer, _
                      ByVal QuantityPerUnit As String, _
                      ByVal UnitPrice As Double)
   Dim conn As New SqlConnection("Server=(local);Integrated 
Security=True;Database=Northwind;Persist Security 
Info=True")
   Dim adapter As New SqlDataAdapter("SELECT * FROM Products WHERE ProductID=" & ProductID, conn)
   Dim ds As New DataSet
   adapter.Fill(ds, "Products")
   With ds.Tables(0).Rows(0)
       .Item("ProductName") = ProductName
       .Item("SupplierID") = SupplierID
       .Item("CategoryID") = CategoryID
       .Item("QuantityPerUnit") = QuantityPerUnit
       .Item("UnitPrice") = UnitPrice
   End With
   Dim cb As New SqlCommandBuilder(adapter)
   adapter.Update(ds, "Products")
End Sub
C# Code-
Code:
public class Products
{
void UpdateProducts(int UID, string firstname, string LastName, string EMail, string Address, string phoneNumb)
    {
        SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=ProductsDB;User ID=gaurav;Password=gaurav");
        SqlDataAdapter da = new SqlDataAdapter("Select * from ProductsTable", conn);
        DataSet ds = new DataSet();
        da.Fill(ds, "ProductsTable");
        I NEED CODE HERE
Help me in converting VB Code to C# Code.