using(OleDbConnection myCon = new OleDbConnection(ConfigurationManager.ConnectionStrings["DbConn"].ToString()))
{
   OleDbCommand cmd = new OleDbCommand(); 
   cmd.CommandType = CommandType.Text; 
   cmd.CommandText = "insert into Items ([Item_Name],[Item_Price]) values (?,?);
   cmd.Parameters.AddWithValue("@item", itemNameTBox.Text);
   cmd.Parameters.AddWithValue("@price", Convert.ToDouble(itemPriceTBox.Text)); 
   cmd.Connection = myCon; 
   myCon.Open(); 
   cmd.ExecuteNonQuery(); 
   myCon.Close(); 
}