How do I get the ID of the selected dynamic radiobutton VB.NET with ASP.NET

Question

0.00/5 (No votes)

See more:

I have dynamically generated radiobuttons, How can I get the id if the dynamic radiobuttons in a textbox (textbox2) when I cick on the selected button.
the code below only works for generating the controls (radio and textboxes), I mean the btnload works but the btnselected does not work (the dynamic controls just vanish and textbox2 dispalys nothing.).

<html>
    <head id="Head1" runat="server">
    <title></title>
    </head>
    <body>
        <form id="form1" runat="server">         
                <asp:Panel ID="container" runat="server">
                                    
                </asp:Panel>       
            <div>
               <asp:Button ID="btnload" runat="server" Text="Load" />  
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                no of loops</div>
                <asp:Button ID="btnselected" runat="server" Text="selected" />
                <asp:TextBox ID="TextBox2" runat="server" style="margin-top: 26px"></asp:TextBox>
        </form>
    </body>
</html>

VB

Protected Sub getradioId_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnload.Click

        Dim tbl As New Table
        tbl.Width = 500

        Dim i As Integer = 0

        Do Until i = TextBox1.Text
            Dim tblrow As New TableRow
            tblrow.Width = 80%

            Dim tblcellrad As New TableCell
            tblcellrad.Width = 100

            Dim tblcellname As New TableCell
            tblcellname.Width = 300

            Dim cand As New TextBox
            cand.ID = i

            i += 1
            Dim rad As New RadioButton   'generate controls (radiobuttons and textbox)
            rad.GroupName = "one"
            rad.ID = i
            rad.Text = "rad" & i
            cand.Text = "candidate " & i.ToString

            If i Mod 2 = 1 Then      'set row colour
                tblrow.Style.Add("background-color", "#EEEEEE")
            Else
                tblrow.Style.Add("background-color", "#E0E0E0")
            End If

            tblcellrad.Controls.Add(rad)    'add controls to cells
            tblcellname.Controls.Add(cand)

            tblrow.Controls.Add(tblcellname) 'add cells to rows
            tblrow.Controls.Add(tblcellrad)


            tbl.Controls.Add(tblrow) 'add row to table
            container.Controls.Add(tbl)

        Loop
    End Sub

Protected Sub btnselected_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnselected.Click
        Dim radios = Controls.OfType(Of RadioButton).AsQueryable()

        For Each r As RadioButton In radios
            If r.Checked Then
                TextBox2.Text = r.ID.ToString
            End If
        Next
    End Sub

Posted 7-Oct-14 3:13am

Member 10316149

Updated 7-Oct-14 3:35am

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-10-07T04:01:00

Solution 1

Refer - Retaining State for Dynamically Created Controls in ASP.NET applications[^].

Quote:
When dynamically adding controls to an ASP.NET page in runtime the object references are lost at postback because they have no handle in the codebehind. The values entered by the user is not availible when accessing these objects after postback, and they seem empty. This article describes how to use ViewState to recreate and reinsert the postback values into the objects to access their values.

You have to recreate the controls in each Post Back.

Posted 7-Oct-14 4:01am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

Member 10316149 7-Oct-14 11:19am

thanks Im now able to retain the the controls with their values but Im not able to iterate through all the radiobuttun controls to get the checked control ID

this is my code,

Protected Sub btnselected_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnselected.Click
Dim radios = Controls.OfType(Of RadioButton).AsQueryable()

For Each r As RadioButton In radios
If r.Checked Then
TextBox2.Text = r.ID.ToString
End If
Next
End Sub

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 7-Oct-14 12:31pm

Are you getting anything in radios?

Member 10316149 15-Oct-14 4:01am

Im really getting nothing (null)