Find which input radio button is checked in code behind - asp.net

Question

I have the following ListView that contains Input radio buttons:
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource_BGlist">
<ItemTemplate>
<input id="Radio1" name="BG_name" type="radio" value="<%# Eval("BG_fileName") % >"/>
<asp:Label ID="BG_fileNameLabel" runat="server" Text='<%# Eval("BG_fileName") %>' />
</ItemTemplate>
</asp:ListView>
<asp:SqlDataSource ID="SqlDataSource_BGlist" runat="server" ConnectionString="Data Source=tcp:cg26trmnla.database.windows.net,1433;Initial Catalog=cookniche;Integrated Security=False;User ID=PublicSQLcookniche#cg26trmnla;Password=Abounakhle80+;Connect Timeout=30;Encrypt=True" ProviderName="System.Data.SqlClient" SelectCommand="SELECT [BG_fileName] FROM [BackgroundImages]"></asp:SqlDataSource>
I want to check which radio button is checked from code behind. I'm using the following code but it's obviously not correct.
foreach (ListViewItem itemRow in this.ListView1.Items)
{
RadioButton radioBtn = new RadioButton();
radioBtn = (RadioButton)itemRow.FindControl("Radio1");
if (radioBtn.Checked)
{
//do stuff
}
}

Answer 1

You are doing almost right. Only few minor things needs to be changed in your code.
Add runat="Server" in your radio button. Because if it will not runat="server" then you will not find radiobutton at code behind. have a look at below HTML code:
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource_BGlist">
<ItemTemplate>
<input id="Radio1" runat="server" name="BG_name" type="radio" value="<%# Eval("BG_fileName") %>"/>
<asp:Label ID="BG_fileNameLabel" runat="server" Text='<%# Eval("BG_fileName") %>' />
</ItemTemplate>
</asp:ListView>
And in your code behind you are casting to RadioButton this RadioButton indicates server side control of radio button. Instead of that you should use HtmlInputRadioButton as shown below:
foreach (ListViewItem itemRow in this.ListView1.Items)
{
var radioBtn = (HtmlInputRadioButton)itemRow.FindControl("Radio1");
if (radioBtn.Checked)
{
// Do Stuff
}
}
To Apply Grouping with RadioButton
<asp:ListView ID="ListView1" runat="server">
<ItemTemplate>
<input runat="server" name="BG_name" type="radio" ID="radio1" value='<%# Eval("Id") %>' ClientIDMode="Static" class="radioBGName" />
<asp:Label ID="BG_fileNameLabel" runat="server" Text='<%# Eval("Title") %>' />
</ItemTemplate>
</asp:ListView>
<script type="text/javascript">
$('.radioBGName').click(function () {
var controlId = $(this).attr('name');
$('.radioBGName').each(function () {
if (controlId != $(this).attr('name')) {
$(this).removeAttr('checked');
}
});
});
</script>

Answer 2

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
RadioButton c1 = (RadioButton)e.Item.FindControl("Radio1");
if (radioBtn.Checked)
{
//do stuff
}
}
}
UPDATE
in Page_Load you need to know the row index and retrieve the control like this
RadioButton radio= this.ListView1.Items[<row_index>].FindControl("Radio1") as RadioButton