I have to click twice a link button to change page - asp.net

Question

I have to click linkbutton twice to change the page and load subfolders of current folder. I think I have some problems with my session and event.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TableRow r = new TableRow();
TableCell c1 = new TableCell();
LinkButton l = new LinkButton();
var strarray = Server.MapPath(Session["url"].ToString()).Split(Path.DirectorySeparatorChar);
Table table = new Table();
l.ID = "lable" + table.Rows.Count;
l.Text = strarray.Last();
l.EnableViewState = true;
r.ID = "newRow" + table.Rows.Count;
c1.ID = "newC1" + table.Rows.Count;
c1.Controls.Add(l);
r.Cells.Add(c1);
table.Rows.Add(r);
this.form1.Controls.Add(table);
}
else
{
if(Directory.Exists(Server.MapPath(Session["url"].ToString())))
{
string[] allFolders = Directory.GetDirectories(Server.MapPath(Session["url"].ToString()));
Table table = new Table();
foreach (string str in allFolders)
{
TableRow r = new TableRow();
TableCell c1 = new TableCell();
LinkButton l = new LinkButton();
var strarray = str.Split(Path.DirectorySeparatorChar);
l.ID = strarray.Last();
l.CommandName = "createLink";
l.Click+= new EventHandler(LinkButton_Command);
l.Text = strarray.Last();
l.EnableViewState = true;
r.ID = "newRow" + table.Rows.Count;
c1.ID = "newC1" + table.Rows.Count;
c1.Controls.Add(l);
r.Cells.Add(c1);
table.Rows.Add(r);
this.form1.Controls.Add(table);
}
}
else
{
Work work=new Work();
work.SetFolder(Session["url"].ToString());
work.CreateFolder();
}
}
}
public void LinkButton_Command(object sender, EventArgs e)
{
Session["url"] = Session["url"] + "\\" + ((LinkButton)sender).ID;
}

Answer 1

I think this is because the Page_Load() method is called before the LinkButton_Command(). The session variable Session["url"] still contains the previous value when the code in Page_Load() executes.
Try moving the code from the else-branch of Page_Load() at the end of LinkButton_Command().

Answer 2

after mix up your answer and my program , come to a answer that will work.
protected void Page_Load(object sender, EventArgs e)
{
if (Directory.Exists(Server.MapPath(Session["url"].ToString())))
{
string[] allFolders = Directory.GetDirectories(Server.MapPath(Session["url"].ToString()));
Table table = new Table();
foreach (string str in allFolders)
{
TableRow r = new TableRow();
TableCell c1 = new TableCell();
LinkButton l = new LinkButton();
var strarray = str.Split(Path.DirectorySeparatorChar);
l.ID = strarray.Last();
l.CommandName = "createLink";
l.Click += new EventHandler(LinkButton_Command);
l.Text = strarray.Last();
l.EnableViewState = true;
r.ID = "newRow" + table.Rows.Count;
c1.ID = "newC1" + table.Rows.Count;
c1.Controls.Add(l);
r.Cells.Add(c1);
table.Rows.Add(r);
this.form1.Controls.Clear();
this.form1.Controls.Add(table);
}
}
}
public void LinkButton_Command(object sender, EventArgs e)
{
Session["url"] = Session["url"] + "\\" + ((LinkButton)sender).ID;
if (Directory.Exists(Server.MapPath(Session["url"].ToString())))
{
string[] allFolders = Directory.GetDirectories(Server.MapPath(Session["url"].ToString()));
Table table = new Table();
foreach (string str in allFolders)
{
TableRow r = new TableRow();
TableCell c1 = new TableCell();
LinkButton l = new LinkButton();
var strarray = str.Split(Path.DirectorySeparatorChar);
l.ID = strarray.Last();
l.CommandName = "createLink";
l.Click += new EventHandler(LinkButton_Command);
l.Text = strarray.Last();
l.EnableViewState = true;
r.ID = "newRow" + table.Rows.Count;
c1.ID = "newC1" + table.Rows.Count;
c1.Controls.Add(l);
r.Cells.Add(c1);
table.Rows.Add(r);
this.form1.Controls.Clear();
this.form1.Controls.Add(table);
}
}
}