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Hiding login panel in master page when users logged in. (ASP.net)

protected void Button1_Click(object sender, EventArgs e)

{

    //hide panel doesn't work

    Panel1.Visible = false;

    //

    SqlCommand cmd = new SqlCommand();

    string str = "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\ava\Desktop\WebSite3\App_Data\news.mdf;Integrated Security=True;User Instance=True";

    SqlConnection conn = new SqlConnection(str);

    conn.Open();

    cmd.CommandText = "select * from users where username=@name and pass=@pass";

    cmd.Connection = conn;

    cmd.Parameters.AddWithValue("name", user.Text);

    cmd.Parameters.AddWithValue("pass", pass.Text);

 

    SqlDataReader dr = cmd.ExecuteReader();

 

    if (dr.HasRows)

    {

        Panel1.Visible = false;

        Panel2.Visible = true;

 

        FormsAuthentication.SetAuthCookie(user.Text, true);

        FormsAuthentication.RedirectFromLoginPage(user.Text, true);

        Response.Redirect("/website3/karbar/karbar.aspx");

 

 

    }

    else user.Text = "Incorrect name or pass";

}

       

if(Request.IsAuthenticated)

{

        Panel1.Visible = false;

        Panel2.Visible = true;

}

       

Panel1.Dispose();

       

Panel1.Style.Add(HtmlTextWriterStyle.Display, "none");

       

protected void Button1_Click(object sender, EventArgs e)

{

   ((Panel)YourMasterPageID.FindControl("YourPanelID")).Visible = false;

}