Create a custum Sharepoint list and add items problems - visual-studio

Question

Im new to SharePoint programming, or programming at all for that case. My problem is that I get a error-message when I try to go to my sharepoint site after I debugged this oode (it worked fine in visual studio). I don't know whats wrong? The error message i get is:
"Server Error in '/' Application.
0x80004005Updates are currently disallowed on GET requests. To allow updates on a GET, set the 'AllowUnsafeUpdates' property on SPWeb."
I've read that you got to allow safe updates? but is that the case? I think maybe it is my code that is not right... Please help :)
// choose your site
SPSite site = new SPSite("http://....");
SPWeb web = SPContext.Current.Web;
//Add a list to the choosen site
SPListCollection lists = web.Lists;
// create new Generic list called "OrdersList"
lists.Add("OrdersTest", "All of my testorders will be here", SPListTemplateType.GenericList);
//Add the new list to the website
SPList newList = web.Lists["OrdersTest"];
// create Number type new column called "OrderID"
newList.Fields.Add("OrderID", SPFieldType.Number, true);
// create Number type new column called "OrderNumber"
newList.Fields.Add("OrderNumber", SPFieldType.Number, true);
// create Text type new column called "OrderProducts"
newList.Fields.Add("OrderProducts", SPFieldType.Text, true);
newList.Update();
//Create a object to that list
SPListItem newOrder = newList.AddItem();
//Add a new item
newOrder["OrderID"] = 1;
newOrder["OrderNumber"] = 1;
newOrder["OrderProducts"] = "Icecream";
newOrder.Update();
// create new Generic list called "ProductTest"
lists.Add("ProductTest", "All of my testproducts will be here", SPListTemplateType.GenericList);
//Add the new list to the website
SPList newList2 = web.Lists["ProductTest"];
// create Number type new column called "ProductID"
newList2.Fields.Add("ProductID", SPFieldType.Number, true);
// create Text type new column called "ProductName"
newList2.Fields.Add("ProductName", SPFieldType.Text, true);
// create Number type new column called "OrderID"
newList2.Fields.Add("ProductPrice", SPFieldType.Number, true);
//Create a object to that list
SPListItem nyProduct = newList2.AddItem();
//Add a new item
nyProduct["ProductID"] = 1;
nyProduct["ProductName"] = "Icecream";
nyProduct["ProductPrice"] = 13;
nyProduct.Update();

Answer 1

You need to set AllowUnsafeUpdates to true for updating data in get requests.
using(SPSite site = new SPSite("http://...."))
using (SPWeb web = site.OpenWeb())
{
bool b = web.AllowUnsafeUpdates;
web.AllowUnsafeUpdates = true;
try
{
//your code
//create and update list
}
catch (Exception ex)
{
//handles errors
}
finally
{
web.AllowUnsafeUpdates = b;
}
}