Two Different Login Pages In One Project (website)

Hi everyone,,

 i have two different login pages in one project which are admin login and student login and they are secure by using the following function in each login page:-

 
Protected Sub btnLogin_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        lblMessage.Text = ""
        If CheckAdminLogin(txtUsername.Text, txtPass.Text) Then
            'If user is valid, then redirect back to original page
            ' and setup authentication cookie
            FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, False)
            'FormsAuthentication.SetAuthCookie(txtUsername.Text, True)
            'Response.Redirect("~/AdminHome.aspx")
            'FormsAuthentication.RedirectToLoginPage(txtUsername.ResolveUrl = "AdminLogin.aspx")
        Else
            'If user is not valid, then display error
            lblMessage.Text = "Invalid Credentials. Please try again"
            lblMessage.Visible = True
        End If
    End Sub
    Function CheckAdminLogin(ByVal sUserName As String, ByVal sPassword As String) As Boolean
        'Declare variables
        Dim sSQL As String
        Dim objDataCommand As SqlCommand
        Dim objConnection As SqlConnection
        Dim iTotal As Integer
        Const connectionString = "Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|MCHQ.mdf;Integrated Security=True;User Instance=True"
        'Create connection and open
        objConnection = New SqlConnection(connectionString)
        objConnection.Open()
        'Build SQL to count no of valid empoyees found with credentials
        sSQL = "Select count(Username) FROM Admin_Profile " & _
            "WHERE (Username = '" & sUserName & _
            "' and Password = '" & sPassword & "')"
        objDataCommand = New SqlCommand(sSQL, objConnection)
        'Execute query and return count (iTotal) of valid records
        iTotal = objDataCommand.ExecuteScalar()
        'If count is 1, then user is valid
        If iTotal = 1 Then
            Return True
        Else
            Return False
        End If
        objConnection.Close()
    End Function
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Response.Cache.SetNoStore()
    End Sub
    Protected Sub txtUsername_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtUsername.TextChanged
        lblMessage.Text = String.Empty
    End Sub
End Class

 the problem is that when i run the website it gave me an error on the path which is looking for the login.aspx only and actually i didn't create this page..
Server Error in '/MCHQ' Application.



The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.

Requested URL: /MCHQ/login.aspx