Too Many Arguments In Procedure

i have written procedure like belowALTER PROCEDURE GetDetails

(@vpid int,

@vpname varchar(30) OUTPUT,

@vprice int OUTPUT

)

 

ASselect @vpname=productname,@vprice=price from fastfood where prod_id=@vpid

 

RETURN

 

and codeSqlConnection con = new SqlConnection();

con.ConnectionString = ConfigurationManager.ConnectionStrings["con"].ConnectionString;SqlCommand cmd = new SqlCommand("GetDetails",con);cmd.CommandType = CommandType.StoredProcedure;

con.Open();

Hashtable items=new Hashtable();items = (Hashtable)Session["basketdata"];string name,price;

 foreach(int s in items.Keys)

{

SqlParameter p1 = new SqlParameter("@vpid", SqlDbType.Int, 10);p1.Direction = ParameterDirection.Input;

p1.Value = s;

cmd.Parameters.Add(p1);

 

//cmd.Parameters.Add("@vpid", SqlDbType.Int, 10).Value=s;cmd.Parameters.Add("@vpname", SqlDbType.Char, 30).Direction=ParameterDirection.Output; cmd.Parameters.Add("@vprice", SqlDbType.Int, 10).Direction=ParameterDirection.Output;

cmd.ExecuteNonQuery();

name = cmd.Parameters["@vpname"].Value.ToString();price = cmd.Parameters["@vprice"].Value.ToString();

 

%>

}

showing too many arguments to procedure