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POCreating multiple querystrings from drop down lists - Could be 1, 2 or 3 querystrings. How do I do it?
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copied!<p>I have a gridview which can be filtered from one or more values in a querystring. That all works great: e.g. <code>"?subject=Maths&authorName=Bond_James&type=Magazine"</code></p> <p>The values passed to the query string come from 3 drop down lists: Subject, Author, Type. What I'd like is when the user presses "Filter" it will take the selected values from the drop down lists and pass them to the querystring - it could be 1 value, 2, or all 3 (like above).</p> <p>The drop down lists have an item called "All Subjects" / "All Author" / "All Type" each with a value of -1. The idea being that if the user leaves these items selected then the Filter button just ignores them.</p> <p>Here is my code so far:</p> <pre><code> Protected Sub buttonFilterGo_Click(ByVal sender As Object, ByVal e As EventArgs) Handles buttonFilterGo.Click Dim queryString As String Dim selectedAuthorString As String = "author=" & dropAuthorList.SelectedItem.Value Dim selectedSubjectString As String = "subject=" & dropSubjectList.SelectedItem.Value Dim selectedTypeString As String = "type=" & dropPaperType.SelectedItem.Value Const PATH As String = "~/paper/browse/?" queryString = selectedAuthorString & "&" & selectedSubjectString & "&" & selectedTypeString If IsNothing(queryString) Then labelFilterFeedback.Text = "Apply some filters then press Go" Else Response.Redirect(PATH & queryString) labelFilterFeedback.Text = "" End If End Sub </code></pre> <p>Also, one more thing. How do I get the drop down lists to have the filters selected when the page re loads?</p> <p>I'd really appreciate any help!</p> <p><strong>EDIT: I changed the default values of the drop down lists to "" - this leaves the URL looking messy though <code>?author=&subject=&type=</code> This works, is it the best way?</strong></p>

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