[Solved] Dynamically created ASP.Net RadioButtonList control loses selected value after PostBack

Hi anvina,

Refer below sample code.

HTML

<asp:Table ID="TableContent" runat="server">
</asp:Table>
<asp:Button ID="ButtonSave" runat="server" Text="Save" OnClick="ButtonSave_Click" />

Code

C#

protected void Page_PreInit(object sender, EventArgs e)
{
    GetMenuHtml();
}

private void GetMenuHtml()
{
    TableRow tr = new TableRow();
    TableCell td = new TableCell();
    RadioButtonList rbuttons = new RadioButtonList();
    rbuttons.ID = "rbl1";
    rbuttons.RepeatLayout = RepeatLayout.Flow;
    rbuttons.AutoPostBack = true;
    rbuttons.EnableViewState = true;
    rbuttons.RepeatDirection = RepeatDirection.Horizontal;
    rbuttons.Items.Add(new ListItem("Yes", "1"));
    rbuttons.Items.Add(new ListItem("No", "0"));
    rbuttons.SelectedIndexChanged += SaveRadioButtons;
    td.Controls.Add(rbuttons);
    td.Controls.Add(new LiteralControl("<br/>"));
    td.Controls.Add(new LiteralControl("<br/>"));
    tr.Controls.Add(td);
    TableContent.Rows.Add(tr);
}
protected void ButtonSave_Click(object sender, EventArgs e)
{
    string message = "";
    for (int i = 0; i < TableContent.Rows.Count; i++)
    {
        foreach (RadioButtonList list in TableContent.Rows[i].Cells[0].Controls.OfType<RadioButtonList>())
        {
            message += list.SelectedValue + ": " + list.SelectedItem.Text;
        }
    }
    ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + message + "');", true);
}

private void SaveRadioButtons(object sender, EventArgs e)
{
    RadioButtonList rb = (RadioButtonList)sender;
    string value = rb.SelectedValue;
    string text = rb.SelectedItem.Text;
}

VB.Net

Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As EventArgs)
        GetMenuHtml()
    End Sub

    Private Sub GetMenuHtml()
        Dim tr As TableRow = New TableRow()
        Dim td As TableCell = New TableCell()
        Dim rbuttons As RadioButtonList = New RadioButtonList()
        rbuttons.ID = "rbl1"
        rbuttons.RepeatLayout = RepeatLayout.Flow
        rbuttons.AutoPostBack = True
        rbuttons.EnableViewState = True
        rbuttons.RepeatDirection = RepeatDirection.Horizontal
        rbuttons.Items.Add(New ListItem("Yes", "1"))
        rbuttons.Items.Add(New ListItem("No", "0"))
        rbuttons.SelectedIndexChanged += AddressOf SaveRadioButtons
        td.Controls.Add(rbuttons)
        td.Controls.Add(New LiteralControl("<br/>"))
        td.Controls.Add(New LiteralControl("<br/>"))
        tr.Controls.Add(td)
        TableContent.Rows.Add(tr)
    End Sub

    Protected Sub ButtonSave_Click(ByVal sender As Object, ByVal e As EventArgs)
        Dim message As String = ""
        For i As Integer = 0 To TableContent.Rows.Count - 1
            For Each list As RadioButtonList In TableContent.Rows(i).Cells(0).Controls.OfType(Of RadioButtonList)()
                message += list.SelectedValue & ": " + list.SelectedItem.Text
            Next
        Next
        ClientScript.RegisterClientScriptBlock(Me.GetType(), "alert", "alert('" & message & "');", True)
    End Sub
    Private Sub SaveRadioButtons(ByVal sender As Object, ByVal e As EventArgs)
        Dim rb As RadioButtonList = CType(sender, RadioButtonList)
        Dim value As String = rb.SelectedValue
        Dim text As String = rb.SelectedItem.Text
    End Sub

Screenshot