Gridview not visible while debugging

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Gridview

Hi all,

i am working with gridview control in asp.net. I have created two columns and i made the property AutoGenerateColumns=false
The code i have written is as follows

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
        <Columns>
        <asp:TemplateField HeaderText ="Type" >
        <ItemTemplate >
        <asp:RadioButton ID="rbtType1" runat="server" Text ="Type1" OnCheckedChanged="rbtType1_CheckedChanged" AutoPostBack="True" />
        <asp:RadioButton ID="rbtType2" runat="server" Text ="Type2" OnCheckedChanged="rbtType2_CheckedChanged" AutoPostBack="True" />
        </ItemTemplate>
        </asp:TemplateField>

        <asp:TemplateField HeaderText ="Items">
        <ItemTemplate >
         <asp:DropDownList ID ="ddlItems" runat="server" ></asp:DropDownList>
        </ItemTemplate>
        </asp:TemplateField>
        </Columns>
        </asp:GridView>

When i debug form doesnt showing gridview... i didnt get what's happening.
Any help would be appreciate.

Thanks