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POHow to Persist Variable on Postback
 

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    <p>I created a single page (with code behind .vb) and created Public intFileID As Integer</p> <p>in the Page load I check for the querystring and assign it if available or set intFileID = 0.</p> <pre><code>Public intFileID As Integer = 0 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then If Not Request.QueryString("fileid") Is Nothing Then intFileID = CInt(Request.QueryString("fileid")) End If If intFileID &gt; 0 Then GetFile(intFileID) End If End If End Sub Private Sub GetFile() 'uses intFileID to retrieve the specific record from database and set's the various textbox.text End Sub </code></pre> <p>There is a click event for the Submit button that inserts or updates a record based on the value of the intFileID variable. I need to be able to persist that value on postback for it all to work.</p> <p>The page simply inserts or updates a record in a SQL database. I'm not using a gridview,formview,detailsview, or any other rad type object which persists the key value by itself and I don't want to use any of them.</p> <p>How can I persist the value set in intFileID without creating something in the HTML which could possibly be changed.</p> <p><strong>[EDIT] Changed Page_Load to use ViewState to persist the intFileID value</strong></p> <pre><code>Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then If Not Request.QueryString("fileid") Is Nothing Then intFileID = CInt(Request.QueryString("fileid")) End If If intFileID &gt; 0 Then GetFile(intFileID) End If ViewState("intFileID") = intFileID Else intFileID = ViewState("intFileID") End If End Sub </code></pre>
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