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public class SubmitOncePage : System.Web.UI.Page
    {
        private string _strSessionKey;
        private string _hiddenfieldName;
        private string _strLastViewstate;
        public SubmitOncePage()
        {
            _hiddenfieldName = "__LastVIEWSTATE_SessionKey";
            _strSessionKey = System.Guid.NewGuid().ToString();
            _strLastViewstate = string.Empty;
        }
        public bool IsRefreshed
        {
            get
            {
                string str1 = GetSessinContent();
                _strLastViewstate = str1;
                string str2 = this.Session[GetSessinKey()] as string;
                bool flag1 = (str1 != null) && (str2 != null) && (str1 == str2);
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                return flag1;
            }
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