Hello Imar,

I’m studying the chapters on Data controls (13- 15) but, in the end, I’m not sure how to overcome the stateless nature of Http.

Let’s suppose I have a WebForm (InsertContract.aspx) to insert the data of new contracts.
After having inserted a few data (contract code, date of start and so on) I realize that I need to pick the Id of the holder of the contract. In order to do that, I need to go to another WebForm (People.aspx) and pick a row from a GridView of people loaded from the Db. Once chosen the right person, I would like to go back to InsertContract.aspx with the Id of the chosen person and find the data already inserted still there.

In a desktop application this is common practice. But I could do that in Asp.Net ? Cache ? Session state ?
Could you point us to a working implementation of the kind ?

Thank you

Antonius

You can redirect to a new page, pick the item thee, and then return its ID to the previous page in the query string. You either lose your data when you redirect, or you need to save it somewhere (in the database for example) temporarily and populate it again when you return.

You could also create a dialog (as an overlay) that shows the new page in an iframe and then communicate the ID back through JavaScript. You can do something similar using AJAX.

Hope this helps,

Imar

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Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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