Databinding of RadioButtonList using SelectedValue…possible?

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>

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 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>

Method 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>

Method 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);
 }

Method 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


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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