Server Error in '/' Application.

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C

ASP.NET

Hello,

please, can anyone help me with this problem am facing in asp.net programming.

I have a login page(.aspx. from where i want to redirect to three different pages (Register1.aspx, register2.aspx and register3.aspx, using three different hyperlink labels. i coded the login.aspx to:

protected void Page_Load(object sender, EventArgs e)
        {
            hlnkHMO.NavigateUrl = "Register1.aspx?ReturnUrl="; + HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);

            hlnkProvider.NavigateUrl = "RegisterProvider.aspx?ReturnUrl="; + HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);

            hlnkEnrollee.NavigateUrl = "RegisterEnrollee.aspx?ReturnUrl="; + HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);
        }

but i am getting this:

Server Error in '/'; Application.
Access is denied.
Description: An error occurred while accessing the resources required to serve this request. The server may not be configured for access to the requested URL.

Error message 401.2.: Unauthorized: Logon failed due to server configuration.  Verify that you have permission to view this directory or page based on the credentials you supplied and the authentication methods enabled on the Web server.  Contact the Web server's administrator for additional assistance.

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET 
Version:4.0.30319.272

please can anyone help out