ASP.net gridview datasource null when sorting

Question

Here we are again with the next problem in sorting.

this is a follow up question to this question

I have now made a type to contain the data I need. however, when I try to fetch the data FROM the gridview it returns null, which means I can't sort anything that is not there in the first place...

any ideas why this returns null ...

IEnumerable<JointServerData> data = gvServers.DataSource;
var sorted = data;
switch (p)
   {
       case "domain":
            sorted = data.OrderBy(o => o.DomainName);
            break;
       default:
            break;
    }
gvServers.DataSource = sorted;
gvServers.DataBind();

above is what I'm trying to do ...

Answer 1

Without seeing all your code I'd have to assume that this is a PostBack issue. Website's are intrinsically stateless and you need to resolve this by either caching information between page requests or retrieving the data each time.