Question

i need to retrive some data from table registration of database to show.aspx page after login. when i register a new user after registration and redirect it to the profile.aspx page then it works fine(showing all required data). but if i do logout and again do login to the same user then the page show.aspx show nothing

I am using this code for user login:

Protected Sub btnLogin_Click1(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim admin As String = "Admin"
    Dim objcmd As New SqlCommand(("select * from Login where UserName='" + txtUserName1.Text & "' And Password='") + txtPassword1.Text & "'", con)
    Dim objReader As SqlDataReader

    con.Open()
    objReader = objcmd.ExecuteReader()
    If objReader.HasRows Then
        While objReader.Read()
            If [String].Compare(objReader("UserType").ToString(), admin) = 0 Then
                Session("UserName_Admin") = txtUserName.Text.ToString().Trim()
                Session("UserName") = txtUserName.Text.ToString().Trim()
                Response.Redirect("adminview.aspx")
            Else
                Session("UserName") = txtUserName.Text.ToString().Trim()
                Response.Redirect("show.aspx")
            End If
        End While
    Else
        lblLoginMessage.Text = "Login failed. Please try again"
    End If
    con.Close()
End Sub

code in the show.aspx page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    If Session("UserName") Is Nothing Then

        Response.Redirect("registration.aspx")

    End If

    binddata()

End Sub
Sub binddata()

    Dim mycommand As New SqlCommand("SELECT * FROM registration where UserName = @UserName", con)
    mycommand.Parameters.AddWithValue("@UserName", Session("UserName").ToString())
    con.Open()
    ProfileData.DataSource = mycommand.ExecuteReader
    ProfileData.DataBind()
    con.Close()
End Sub
Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Response.Redirect("upimg.aspx")
End Sub

i am using a datalist to retrieve data from database in show.aspx page.
is there anything i need to change in web.config file . a help will be appreciated

Answer 1

Is your logout code clearing the session values?

I think you would be far better off using the ASP.net Membership and Roles to handle this functionality because it will be much more secure and flexible.

Check out here an article explaining how to get setup here