how to handle login problem

Question

i have website and a login page ,in which user name and password is required,
problem is that when i enter username and password correct ,then it has to redirected me to another page passing through xsrf token,

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private const string AntiXsrfTokenKey = "__AntiXsrfToken";         private const string AntiXsrfUserNameKey = "__AntiXsrfUserName";         private string _antiXsrfTokenValue;           protected void Page_Init(object sender, EventArgs e)                  {             // The code below helps to protect against XSRF attacks             var requestCookie = Request.Cookies[AntiXsrfTokenKey];             Guid requestCookieGuidValue;             if (requestCookie != null && Guid.TryParse(requestCookie.Value, out requestCookieGuidValue))             {                 // Use the Anti-XSRF token from the cookie                 _antiXsrfTokenValue = requestCookie.Value;                 Page.ViewStateUserKey = _antiXsrfTokenValue;             }             else             {                 // Generate a new Anti-XSRF token and save to the cookie                 _antiXsrfTokenValue = Guid.NewGuid().ToString("N");                 Page.ViewStateUserKey = _antiXsrfTokenValue;                   var responseCookie = new HttpCookie(AntiXsrfTokenKey)                 {                     HttpOnly = true,                     Value = _antiXsrfTokenValue                 };                 if (FormsAuthentication.RequireSSL && Request.IsSecureConnection)                 {                     responseCookie.Secure = true;                 }                 Response.Cookies.Set(responseCookie);             }               Page.PreLoad += master_Page_PreLoad;         }           protected void master_Page_PreLoad(object sender, EventArgs e)         {             if (!IsPostBack)             {                 // Set Anti-XSRF token                 ViewState[AntiXsrfTokenKey] = Page.ViewStateUserKey;                 ViewState[AntiXsrfUserNameKey] = Context.User.Identity.Name ?? String.Empty;             }             else             {                 // Validate the Anti-XSRF token                 if ((string)ViewState[AntiXsrfTokenKey] != _antiXsrfTokenValue                     || (string)ViewState[AntiXsrfUserNameKey] != (Context.User.Identity.Name ?? String.Empty))                 {                     throw new InvalidOperationException("Validation of Anti-XSRF token failed.");                 }             }         } 

it was working properly ,but today when i logged in instead of going to redirected page ,it return following url and move no where,i have cleared up cookies.