SAConnection conn = new SAConnection( "Data Source=SQL Anywhere 12 Demo" );
conn.Open();
bool method1 = true;

SACommand cmd = new SACommand("", conn);
if (method1)
{
    cmd.CommandText = "ShowProductInfo";
    cmd.CommandType = CommandType.StoredProcedure;
}
else
{
    cmd.CommandText = "call ShowProductInfo(?)";
    cmd.CommandType = CommandType.Text;
}

SAParameter param = cmd.CreateParameter();
param.SADbType = SADbType.Integer;
param.Direction = ParameterDirection.Input;
param.Value = 301;
cmd.Parameters.Add(param);

SADataReader reader = cmd.ExecuteReader();
reader.Read();
int ID = reader.GetInt32(0);
string name = reader.GetString(1);
string description = reader.GetString(2);
decimal price = reader.GetDecimal(6);
reader.Close();

listBox1.BeginUpdate();
listBox1.Items.Add("Name=" + name +
    " Description=" + description + " Price=" + price);
listBox1.EndUpdate();

conn.Close();