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.NET Forum / ASP.NET / General / February 2006view state in previous page using cross page postback
Is there a way to retrieve values from the viewstate in the previouspage using cross page postback? Thanks! Bill ASP.NET 2.0 resolves this by embedding a hidden input field name, __POSTBACK . This field is embedded only when there is an IButtonControl on the page and its PostBackUrl property is set to a non-null value. The field contains the view state information of the poster page. To access the view state of the poster page, you can use the new PreviousPage property of the page: Page poster = this.PreviousPage; Then you can find any control from the previous page and read its state: Label posterLabel = poster.findControl("myLabel"); string lbl = posterLabel.Text; Peter  SignatureCo-founder, Eggheadcafe.com developer portal: http://www.eggheadcafe.com UnBlog: http://petesbloggerama.blogspot.com > Is there a way to retrieve values from the viewstate in the previouspage > using cross page postback? > > Thanks! > Bill I think that what Bill wants is a way to access the viewstate on the previous page so if you add any items to viewstate i.e viewstate.add("whatever", "somedata") and then retrieving on the next page the viewstate("whatever")... Is that right Bill? Yes, that is correct - sorry for not expressing it clearly. >I think that what Bill wants is a way to access the viewstate on the > previous page so if you add any items to viewstate i.e > viewstate.add("whatever", "somedata") and then retrieving on the next > page the viewstate("whatever")... > Is that right Bill? Ah. Haven't found a way to do that. Controls and their state, yes. The actual ViewState collection, no. Of course, remember that ViewState is not designed for cross-page operations. You can use Session, Cache, Application, or the HttpContext Items collection for things like that, depending on which is appropriate. Peter SignatureCo-founder, Eggheadcafe.com developer portal: http://www.eggheadcafe.com UnBlog: http://petesbloggerama.blogspot.com > Yes, that is correct - sorry for not expressing it clearly. > >I think that what Bill wants is a way to access the viewstate on the > > previous page so if you add any items to viewstate i.e > > viewstate.add("whatever", "somedata") and then retrieving on the next > > page the viewstate("whatever")... > > Is that right Bill? Ok Bill, i found it for you! You cannot do that. Here is the Microsoft note about what you want "If the source and target page are in different applications, you cannot directly get the values of controls on the page, but you can read the posted data from the Form dictionary. You cannot read view state from the source page, because it is hashed. If you want to store values in the source page and make them available in a target page in another application, you can store the values as strings inside hidden fields on the source page and access them through Request.Form on the target page." http://msdn2.microsoft.com/en-us/library/ms178139(vs.80).aspx I think I remember reading that, but thinking that they were still referring to the source and target page being in different applications. I thought that because the following sentence also refers to "another application". Wishful thinking! I would like to use the viewstate because I have to store a username/password and grab it in the target page, and I don't want to use hidden fields since view source will reveal the password. I guess I'll try using properties. Thanks for your help! Bill > Ok Bill, i found it for you! You cannot do that. Here is the Microsoft > note about what you want [quoted text clipped - 9 lines] > > http://msdn2.microsoft.com/en-us/library/ms178139(vs.80).aspx Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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