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 ...

Mark · Accepted Answer · 2009-06-11 07:26:24Z

5

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.

answered Jun 11, 2009 at 7:26

Mark

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Tror · Accepted Answer · 2009-06-11 07:40:27Z

5

I agree with Mark. It seems that this happens between postbacks. If so, you can't have access to grid's datasource, because after first binding and rendering this grid to html, you will receice only that html on postback, but not real datasource. You need to keep your datasource either in session or get it on every postback from database.

P.S. and sorry, guys, for my ugly English :-[

answered Jun 11, 2009 at 7:40

Tror

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user229044 · Accepted Answer · 2021-11-22 03:45:23Z

0

Try to set data binding in Init event of control.

edited Nov 22, 2021 at 3:45

user229044♦

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answered Jun 11, 2009 at 7:24

user94893

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Andro Selva · Accepted Answer · 2012-10-22 09:21:05Z

-1

Other thing to point out is that GridView does not keep DataSource property populated over the postbacks (for performance feasons since it would need to

serialize and roundtrip the entire data source)

Teemu Keiski ASP.NET MVP, AspInsider Finland, EU

from http://bytes.com/topic/asp-net/answers/828307-gridview1-datasource-null or you use linq datasource for yor linq queries. it automatically handles sorting process.

edited Oct 22, 2012 at 9:21

Andro Selva

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answered Oct 22, 2012 at 9:00

serkanh

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serialize and roundtrip the entire data source)

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