Display the homepage if cat_id & Sub_CAT_ID doesn't exists..

This Code will redirect to HomePage Whatever we will write in the Url of ResultPage. i.e Alphabet,Numbers,Remove whole Url after ?......



protected void Page_Load(object sender, EventArgs e)
{

int iCatID;
int iSubCatID;
string j = Request.QueryString["Cat_Id"];
string i = Request.QueryString["Sub_Cat_Id"];

SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=D:\site\SamsungClassifieds\App_Data\Dorknozzle.mdf;Integrated Security=True;User Instance=True");
con.Open();
if (i == null && j == null)
{
Response.Redirect("HomePage.aspx");
}
else
if((int.TryParse(i.ToString(), out iCatID))&&(int.TryParse(j.ToString(), out iSubCatID)))
{
//Do your DB retrieval here .....
SqlDataAdapter cmd = new SqlDataAdapter("SELECT AD_ID,AD_TITLE, AD_DESC, AD_IMG, AD_PRICE, AD_NO, SUB_CAT_DESC, CAT_DESC, SELLER_NAME, SELLER_MOB_NO, SELLER_EMAIL_ID, SELLER_DEP, SELLER_FLOOR,DATE FROM AD_DETAIL_V WHERE (DATE >= { fn CURDATE() }) and BUY_SELL_ID='1' and DELETED_AD = '0' AND SUB_CAT_ID= " + iCatID.ToString() + "AND CAT_ID =" + iSubCatID.ToString(), con);
DataSet ds = new DataSet();
cmd.Fill(ds);
int count = ds.Tables[0].Rows.Count;
if (count == 0)

Response.Redirect("HomePage.aspx");

gvImages.DataSource = ds;
gvImages.DataBind();
}
else
{ //Handle the parameter type error (i.e. - display a message or redirect user)
Response.Redirect("HomePage.aspx");
}
}

hOW TO display a data of id and its sub ids in treeview
this is my code in c# and ms access data base it not displaying all of it

private void button2_Click(object sender, EventArgs e)
{
l:

try
{

con = new OleDbConnection(cs);
con.Open();
//Sales.ReferenceID = Customer.CustomerID and
cmd = new OleDbCommand("SELECT * from Sales where CustomerID='" + textBox22.Text + "' order by CustomerID ASC ", con);
OleDbDataAdapter myDA = new OleDbDataAdapter(cmd);
DataTable rdr = new DataTable();
myDA.Fill(rdr);

for (int i = 0; i < rdr.Rows.Count; i++)
{
TreeNode node = new TreeNode(rdr.Rows[i]["CustomerNameSales"].ToString());
node.Nodes.Add(rdr.Rows[i]["ReferenceID"].ToString());
node.Nodes.Add(rdr.Rows[i]["CustomerID"].ToString());
node.Nodes.Add(rdr.Rows[i]["Rank"].ToString());
node.Nodes.Add(rdr.Rows[i]["checkcol"].ToString());
treeView1.Nodes.Add(node);
}


con.Close();

}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

try
{

con = new OleDbConnection(cs);
con.Open();
String ct102000 = "SELECT CustomerID from Sales where ReferenceID = '" + textBox22.Text + "'";
cmd = new OleDbCommand(ct102000, con);
rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);


if ((rdr.Read() == true))
{

textBox21.Text = (rdr["CustomerID"].ToString());
textBox22.Text = textBox21.Text;

if (textBox22.Text != null)
{
goto l;

}

goto l;
}

con.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}



}
give me a solution