Working with classes

Hello Everyone here,
I m still beginer in ASP.net. I have a data base file called products which has the following fields 
 

[Productid] [int] IDENTITY(1,1) NOT NULL,
        [Productname] [varchar](50) NULL,
        [Descs] [varchar](50) NULL,
        [Quantity] [int] NULL,
        [amountvalue] [float] NULL,
        [productpendingamount] [float] NULL,
 CONSTRAINT [PK_Products] PRIMARY KEY CLUSTERED 

and I have made a class which will retrive the data from the database. I want to write the product number in the field of product name and once I press enrer the data will be displayed in the textboxes for the product name, product desc and so on. the following code I have made for both class file and the calling code for this class.

public void showdproductetails (int a, string b, string c, int d, float e, float f)    {       
 string strc = ConfigurationManager.ConnectionStrings["Products"].ConnectionString;   
 SqlConnection con = new SqlConnection(strc);   
     con.Open();       
 SqlCommand cmd = new SqlCommand();    
    cmd.Connection = con; 
       cmd.CommandText = "select Productname, Descs, Quantity, amountvalue, productpendingamount from Products where productid = @a";    
    cmd.Parameters.AddWithValue("a", a);      
  SqlDataReader rd = cmd.ExecuteReader();     
   while (rd.Read())      
  {            b = rd.GetString(0);   
         c = rd.GetString(1);         
   d = rd.GetInt32(2);        
    e = rd.GetFloat(3);       
     f = rd.GetFloat(4);      
  }

the follwing code is for the calling of the class:

Products objfind = new Products();        objfind.showdproductetails(int.Parse(TextBox1.Text), TextBox2.Text, TextBox3.Text, int.Parse(TextBox4.Text), float.Parse(TextBox5.Text), float.Parse(TextBox6.Text));