View State Causing DataList to disappear

We have a ArrayList that we bind to a DataList, then we create a viewstate that contains the ArrayList.  The final line in the code,

ViewState["ParamArray"] = alParams;

is causing the DataList to disappear when we debug. If I comment out the above line, the DataList appears. Any help is appreciated.

PS - I am kind of new to ASP.NET, so let me apologize if my phrasing or anything is incorrect.

//dlParams is a DataList
 
               ArrayList alParams= new ArrayList();
                
                foreach (string s in _xmlParams)
                {
                    ReportParameters reportParameters = new ReportParameters();
                    
                    etc, etc, etc, etc
 
                    reportParameters.ID = newID;
                    reportParameters.Caption = newTitle;
                    reportParameters.DefaultValue = defval;
 
                    alParams.Add(reportParameters);
                    dlParams.DataSource = alParams;
                    dlParams.DataBind();
 
                    ViewState["ParamArray"] = alParams;
 
                }

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