Server Error in '/' Application.

Value cannot be null.
Parameter name: String

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: String

Source Error: 


Line 26:     {
Line 27:         ue = new UserEvent();
Line 28:         ue.Get(Int32.Parse(Request.QueryString["UserEvent_ID"]));
Line 29:         evt = new DolphinDB.Event();
Line 30:         evt.Get(ue.EventID);

Source File: c:\Inetpub\nycswim.org\docs.3.5\Event\EnrollmentReceiptPage.aspx.cs    Line: 28

Stack Trace: 


[ArgumentNullException: Value cannot be null.
Parameter name: String]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +5510289
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +203
   EnrollmentReceiptPage.Page_Load(Object sender, EventArgs e) in c:\Inetpub\nycswim.org\docs.3.5\Event\EnrollmentReceiptPage.aspx.cs:28
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +48
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Control.OnLoad(EventArgs e) +133
   System.Web.UI.Control.LoadRecursive() +66
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2604

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433