Databinding of RadioButtonList using SelectedValue...possible? - asp.net

Question

I am databinding a GridView to an object datasource. The gridview contains a TemplateField which contains a RadioButtonList with ListItems defined inline.
I want to be able to databind the SelectedValue of the RadioButtonList to the same underlying table as the other grid columns, but it doesn't work!
Do I have my syntax wrong, or is this impossible and requires looping code to individually select the proper item in each row?
<llblgenpro:LLBLGenProDataSource ID="llbComputerApplication" DataContainerType="EntityCollection" runat="server"></llblgenpro:LLBLGenProDataSource>
<asp:GridView ID="gridComputerApps" DataSourceID="llbComputerApplication" runat="server" AutoGenerateColumns="False"
EmptyDataText ="NO APPLICATIONS FOUND FOR THIS COMPUTER."
DataKeyNames="ComputerID, ApplicationID" EnableViewState="False"
style="border-style:dotted;border-width:thin"
>
<Columns>
<asp:BoundField DataField="ApplicationID" HeaderText="Application ID" SortExpression="ApplicationID" Visible="True" />
<asp:TemplateField HeaderText="Application Name"><ItemTemplate><%#Eval("Application.ApplicationName")%></ItemTemplate></asp:TemplateField>
<asp:TemplateField HeaderText="Normalized Name"><ItemTemplate><%#Eval("Application.NormalizedAppName")%></ItemTemplate></asp:TemplateField>
<asp:TemplateField HeaderText="Notes"><ItemTemplate><%#Eval("Application.NormalizedNotes")%></ItemTemplate></asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
</HeaderTemplate>
<ItemTemplate>
<asp:RadioButtonList SelectedValue='<%#Eval("RequirementOption")%>' ID="rblRequirementOption" RepeatDirection="Horizontal" runat="server">
<asp:ListItem Value="Need Now" Text="Need Now"></asp:ListItem>
<asp:ListItem Value="Need Someday" Text="Need Someday"></asp:ListItem>
<asp:ListItem Value="Do Not Need" Text="Do Not Need"></asp:ListItem>
</asp:RadioButtonList>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="NormalizedNotes" HeaderText="Notes" Visible="False" />
</Columns>
</asp:GridView>

Answer 1

What you have should work. Are you getting an error? Here's a working example copied from my current project. I'm binding to a nullable bit field - so have a hidden list item to accept the nulls.
<asp:RadioButtonList runat="server" ID="MyRbl" SelectedValue='<%# Bind("MyRblField") %>'
CssClass="NormalTextBox" RepeatDirection="Horizontal">
<asp:ListItem Value="false" Text="No" />
<asp:ListItem Value="true" Text="Yes" />
<asp:ListItem Value="" Text="" style="display: none" />
</asp:RadioButtonList>

Answer 2

I also experienced this problem (nothing selected in radiobuttonlist) when binding against boolean values in MS SQL:
radDefault.Items.Add(new ListItem("Yes", "true"));
radDefault.Items.Add(new ListItem("No", "false"));
In my case, the solution was to capitalize the first letter of the true/false values, then the radiobuttonlistworked as expected:
radDefault.Items.Add(new ListItem("Yes", "True"));
radDefault.Items.Add(new ListItem("No", "False"));
Or, declaratively:
<asp:RadioButtonList runat="server" ID="radDefault" SelectedValue='<%# Bind("DB_FIELD") %>'>
<asp:ListItem Value="False" Text="No" />
<asp:ListItem Value="True" Text="Yes" />
</asp:RadioButtonList>

Answer 3

I didn't like the idea of using css to hide an item. Instead, I found this solution to add a blank item but remove it in the code behind.
<asp:RadioButtonList ID="MyRadioButtonList" runat="server"
SelectedValue='<%# Bind("Blah") %>'
OnDataBound="MyRadioButtonList_DataBound">
<asp:ListItem Value=""></asp:ListItem>
<asp:ListItem Value="A"></asp:ListItem>
<asp:ListItem Value="B"></asp:ListItem>
<asp:ListItem Value="C"></asp:ListItem>
</asp:RadioButtonList>
protected void MyRadioButtonList_DataBound(object sender, EventArgs e)
{
RadioButtonList list = (RadioButtonList)sender;
ListItem blank = list.Items.FindByValue("");
if (blank != null)
list.Items.Remove(blank);
}

Answer 4

<asp:RadioButtonList runat="server" ID="MyRbl" SelectedValue='<%# Bind("MyRblField") %>'
CssClass="NormalTextBox" RepeatDirection="Horizontal">
<asp:ListItem Value="false" Text="No" />
<asp:ListItem Value="true" Text="Yes" />
<asp:ListItem Value="" Text="" selected="true" style="display: none" />
</asp:RadioButtonList>
It work me .....
gnanasekar.s vilangulathur