Insert text from dynamic text boxes to database - asp.net

Question

i had created a text box control array using the following code, where the no.of controls are generated on the basics of the value selected from the combo box
Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Dim lstTextBox = New List(Of TextBox)()
For i As Integer = 0 To DropDownList1.SelectedValue
for j as integer =0 to 3
Dim txtbx As New TextBox()
txtbx.ID = String.Format("txtbx{0}", j)
lstTextBox.Add(txtbx)
txtbx.Text = "sample text " & j
form1.Controls.Add(txtbx)
next
Next
Session("lstTextBox") = lstTextBox
End Sub
now i need to insert the value to the database on a single button click, here the code is
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
dim mysql as string
mysql="insert into mytable values("
Dim lstText = New List(Of TextBox)()
lstText = Session("lstTextBox")
For i As Integer = 0 To lstText.Count - 1
for j as integer =0 to 3
mysql= mysql & "'" & trim(lstText(j).Text) & "',"
next
'execute insert for each row with the mysql string
Next
End Sub
now the problem is: only the initial values in the text boxes are inserted to the database, the changes which i had made in the text boxes are not inserted to the database. ie, in session the initial values will not change on text change in the text box.
i need a solution for this problem for proceeding my work. so expert's kind attention please.. positive responses will be appreciated.

Answer 1

Am not sure about VB and as well as My Sql. But i can give you a some way to get rid off from Session
Try like this in DropDownList1_SelectedIndexChanged,
if(Session("lstTextBox"))==null
Session("lstTextBox") = lstTextBox
else
Session.Abandon()
Session("lstTextBox") = lstTextBox
Now you go can check whether session is updating or not. As well as you may get the result as you want. Please let me know the output.