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copied!<p>You could have a class that you instantiate at the top of each page that will handle this for you. I've written an example below. ++Note that this is untested, I just threw it together to give you an idea++:</p> <pre><code>public class QueryStringState { private Dictionary<string, string> m_Params = new Dictionary<string, string>(); private System.Web.UI.Page m_Page; // ctor public QueryStringState(System.Web.UI.Page _page, params string[] _persistArgs) { m_Page = _page; foreach (string key in _page.Request.QueryString.Keys) { if (_persistArgs.Contains(key)) // are we persisting this? m_Params[key] = _page.Request.QueryString[key]; }; } // eo ctor // Resolve Url public string ResolveUrl(string _url) { // Resolve the URL appropriately string resolved = m_Page.ResolveUrl(_url); // Add our arguments on to the Url. This assumes that they have NOT been // put on the query string manually. Uri uri = new Uri(resolved); StringBuilder builder = new StringBuilder(uri.Query); if(uri.Query.Length > 0) builder.Append("&"); int counter = 0; foreach(KeyValuePair<string, string> pair in m_Params) { builder.AppendFormat("{0}={1}", pair.Key, pair.Value); ++counter; if(counter < m_Params.Count) builder.Append("&"); }; return(string.Concat(resolved, builder.ToString())); } }; </code></pre> <p>Let this class be a member of your page:</p> <pre><code>private QueryStringState m_QueryStringState = null; </code></pre> <p>And instantiate during initialisation, passing the names of any arguments you want to persist on the query string through pages:</p> <pre><code>m_QueryStringState = new QueryStringState(this, "param1", "param2"); </code></pre> <p>Then you must make sure that any URLs that leave the page are passed through the ResolveUrl() method of this class:</p> <pre><code>myObject.HyperLink = m_QueryStringState.ResolveUrl("~/index/mypage.aspx"); </code></pre> <p>As I stated, this is untested as I don't have the time right now to make sure it works exactly as intended but is to give you a general idea of how this might be solved. </p>

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