GridView RadioButtonList Values

[renuami]

Hello friends please advise.......

I am building an application for Survey. For this i have GridView with two Template fields. The first Template has Label (To display question text) and RadioButtonList (for options). The 2nd Template field is the primary key value. And i have a button on the form.

In the button click event i wrote code to grab RadioButtonList values.But the selected value is coming as null....PLEASE ADVISE....

Let me know if my question is unclear!!!!!

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" GridLines="None">

<Columns>

<asp:TemplateField SortExpression="Question_Text">

<EditItemTemplate>

<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Question_Text") %>'></asp:TextBox>

</EditItemTemplate>

<ItemTemplate>

<asp:Label ID="Label10" runat="server" Text='<%# Bind("Question_Text") %>'></asp:Label>

<asp:RadioButtonList ID="RadioButtonList1" Visible='<%# GetRadioSetting(Eval("Answer_Type")) %>' runat="server" RepeatColumns="5" RepeatDirection="Horizontal"

RepeatLayout="Flow" Width="400px">

<asp:ListItem>N/A</asp:ListItem>

<asp:ListItem>1</asp:ListItem>

<asp:ListItem>2</asp:ListItem>

<asp:ListItem>3</asp:ListItem>

<asp:ListItem>4</asp:ListItem>

</asp:RadioButtonList>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField SortExpression="Question_Number" Visible="False">

<EditItemTemplate>

<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Question_Number") %>'></asp:TextBox>

</EditItemTemplate>

<ItemTemplate>

<asp:Label ID="Label2" runat="server" Text='<%# Bind("Question_Number") %>'></asp:Label>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />

protected void Button1_Click(object sender, EventArgs e)
{

IDictionary<int, string> values = new Dictionary<int, string>();

foreach (GridViewRow row in GridView1.Rows)
{
// Assuming Question_Number is placed into DataKeyNames property
int questionNumber = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);

RadioButtonList lst = row.FindControl("RadioButtonList1") as RadioButtonList;
string answer = (lst != null) ? lst.SelectedValue.ToString() : String.Empty;

values.Add(questionNumber, answer);
}

}

questionNumber value is coming correct.but answer="" for all the questions.

PLEASE ADVISE.....