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POHow to persist Asp Net GridView data (coming from SignalR) after page postback?
 

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  1. POHow to persist Asp Net GridView data (coming from SignalR) after page postback?
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    <p>I create module in DotNetNuke CMS. Ihave no need to edit my data, just display with sorting and paging. There is asp:GridView control which has DataTable as data source. In Page_Load event some rows with data are added to dataTable and properly displayed. Sorting and pagging work ok too. To maintain data in GridView (and for sorting purposes) used ViewState. I choosed using of ViewState to not overload the server, incoming data doesn't have to be secure. For incoming data I use SignalR, so javascript function receives data from server(hub). Figured out that I will call from javascript web method(C#) AddNewRowToDataTable (DateTime time, string name, double value...) passing parameters to the method. Unfortunatelly web method must be static and this is the reason why ViewState can not be used in it. So if I can't use ViewState when adding new row I lose all data. This doesn't help:</p> <pre><code>[WebMethod] public static void AddNewRowToDataTable(DateTime time, string name, double value) { Page page = HttpContext.Current.Handler as Page; if (page != null) { if (page.ViewState["dtValues"] != null) { // Get the DataTable from ViewState and inserting new data to it. DataTable dtValues = (DataTable)page.ViewState["dtValues"]; // Add the new row. dtValues.Rows.Add(new object[] { time, name, value }); // Rebind the GridView control to show inserted data. BindGridView(); } } } </code></pre> <blockquote> <p>Error Cannot access protected member 'System.Web.UI.Control.ViewState' via a qualifier of type 'System.Web.UI.Page'; the qualifier must be of type 'Christoc.Modules.DNNSignalR.View' (or derived from it)</p> </blockquote> <p>I preferr not to use Session for maintaing data because don't want to heavy load on server side.</p> <p>What would be the best approach to my requirements: In Asp Net, DotNetNuke module, display data coming from SignalR with sorting and paging functionality, not losing data on postbacks?</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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