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Invalid postback or callback argument. Event validation is enabled using<pages enableE... Page 1 of 1 <br /> • <br /> Server Error in '/PLANDEV/PERMITS/zoningPermit' Application. <br /> Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation=r"true'7> in <br /> configuration or<%@ Page EnableEventValidation="true"%> in a page. For security purposes, this feature verifies <br /> that arguments to postback or callback events originate from the server control that originally rendered them. If the <br /> data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the <br /> postback or callback data for validation. <br /> 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. <br /> Exception Details:System.ArgumentExceptbn:Invalid postback or callback argument. Event validation is enabled using<pages enableEventValidation="true"/>in configuration or<%@ Page <br /> EnableEventValidation='true'%>in a page.For security purposes,this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and <br /> expected,use the ClientScdptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. <br /> Source Error: <br /> An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the <br /> exception can be identified using the exception stack trace below. <br /> Stack Trace: <br /> [ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventvalidation="true"/> in configuration or <%( <br /> system.web.Ul.Clientscriptuanager.validateEvent(string uniquexd, string argument) +2127900 <br /> System.web.ul.control.validateEvent(string uniqueID, String eventArgument) +106 <br /> System.Web.uI.WebControls.DropoownList.LoadPostData(String postDataKey, NameValueCollection postCollection) +55 <br /> System.Web.Ul.WebControls.DropDowniist.System.Web.uI.IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) +11 <br /> System.web.uI.Page.Processpostoata(NameValueCollection postoata, Boolean fBeforeLoad) +408 <br /> System.web.UI.Page.ProcessBequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3776 <br /> Version Information:Microsoft NET Framework Version:2.0.50727.832,ASP.NET Version.2.0.50727.832 <br /> http://www.countyofdane.com/plandev/permits/zoningPermit/default.aspx?parcel number... 7/31/2008 <br />