Display Total of the Selected Value of Three DropDownLists in TextBox in ASP.Net

Hi,

I tried to do it:

In first page we have 3 dropdownlist and a button

in button click event we send dropdownlistes values to second page (default4.aspx) via querystring

and in secend page we create textboxes dinamically

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this link will help you:

Createing Dynamic TextBox Controls in ASP.Net

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I wrote this in first page:

 Protected Sub btn_confirm_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_confirm.Click
        Dim st As String = "Default4.aspx?"
        st += "value1=" + DropDownList1.SelectedValue & "&"
        st += "value2=" + DropDownList2.SelectedValue & "&"
        st += "value3=" + DropDownList3.SelectedValue

        Response.Redirect(st)
    End Sub

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in second page:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim value1 As String = Request.QueryString("value1")
        Dim value2 As String = Request.QueryString("value2")
        Dim value3 As String = Request.QueryString("value3")
        Dim total As Integer = Convert.ToInt32(value1) + Convert.ToInt32(value2) + Convert.ToInt32(value3)
        For i As Integer = 0 To total - 1
            Dim txt As New TextBox()

            txt.ID = "txt" & i.ToString()

            Form.Controls.Add(txt)
        Next
    End Sub