Nasted GridView using Entity DataModel

Page View:-

Under showdata button_click

protected void Button1_Click(object sender, EventArgs e)

{

   try

    {

    Utility obj = new Utility();

    GridView1.DataSource = obj.Getrest();

    GridView1.DataBind();

    for (int i = 0; i < GridView1.Rows.Count; i++)

      {

        GridView gv = (GridView)GridView1.Rows[i].FindControl("GridView2");

        Label bv = (Label)GridView1.Rows[i].FindControl("lbl");

        gridviewModel.menu obj1=new gridviewModel.menu ();

        gv.DataSource = obj.Getmenu(bv.Text);

        gv.DataBind(); 

      }

    }

   catch (Exception ex)

   {

   Response.Write(ex.Message);

   }

 }

Gridview Source Code:-

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"

  Height="183px" Width="584px" CellPadding="4" ForeColor="#333333"

  GridLines="None">

  <AlternatingRowStyle BackColor="White" ForeColor="#284775" />

  <Columns>                       

  <asp:TemplateField HeaderText ="Rid">

  <ItemTemplate>

  <asp:Label runat="server" ID="lbl"  

  Text='<%#Eval("Rid") %>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>

  <asp:TemplateField HeaderText ="Hotel Name">

  <ItemTemplate>

  <asp:Label runat="server" ID="lbl1" Text='<%#Eval("name") %>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>

  <asp:TemplateField HeaderText ="Location">

  <ItemTemplate>

  <asp:Label runat="server" ID="lbl2" 

  Text='<%#Eval("location") %>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>

  <asp:TemplateField HeaderText ="Menus">

  <ItemTemplate>

  <asp:GridView ID="GridView2" runat="server"  AutoGenerateColumns="false"

  style="margin-right: 2px"

  Width="369px" BackColor="White"

  BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px">

  <Columns>                       

  <asp:TemplateField HeaderText="Mid">

  <ItemTemplate>

  <asp:Label ID="Label1" runat="server" 

  Text='<%#Eval("mid") %>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>

  <asp:TemplateField HeaderText ="Item Name">

  <ItemTemplate>

  <asp:Label ID="Label2" runat="server"           

  Text='<%#Eval("itemname")%>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>

  <asp:TemplateField HeaderText ="Price">

  <ItemTemplate>

  <asp:Label ID="Label2" runat="server"  

  Text='<%#Eval("price") %>'></asp:Label>

  </ItemTemplate>

  </asp:TemplateField>                                           

  </Columns>

  <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />

  <HeaderStyle BackColor="Indigo" Font-Bold="True" ForeColor="#CCCCFF" />

  <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left"/>

  <RowStyle BackColor="White" ForeColor="#003399" />

  <SelectedRowStyle BackColor="#009999" Font-Bold="True"

  ForeColor="#CCFF99"/>

  <SortedAscendingCellStyle BackColor="#EDF6F6" />

  <SortedAscendingHeaderStyle BackColor="#0D4AC4" />

  <SortedDescendingCellStyle BackColor="#D6DFDF" />

  <SortedDescendingHeaderStyle BackColor="#002876" />

  </asp:GridView>

  </ItemTemplate>

  </asp:TemplateField>

  </Columns>

  <EditRowStyle BackColor="#999999" />

  <FooterStyle BackColor="#5D7B9D" ForeColor="White" Font-Bold="True" />

  <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />

  <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center"/>

  <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />

  <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333"/>

  <SortedAscendingCellStyle BackColor="#E9E7E2" />

  <SortedAscendingHeaderStyle BackColor="#506C8C" />

  <SortedDescendingCellStyle BackColor="#FFFDF8" />

  <SortedDescendingHeaderStyle BackColor="#6F8DAE" />

  </asp:GridView>

Add ADO.NET Entity Data Model under App_code and select database tables

  add new class Utility.cs and write code under utility class

Under Utility Class:-

 public List<gridviewModel.rest> Getrest()

   {

      gridviewModel.gridviewEntities obj = new gridviewModel.gridviewEntities();

      var x = from n in obj.rests select n;

      return x.ToList<gridviewModel.rest>();

   }

public List<gridviewModel.menu> Getmenu(object ss)

   {

      int s = int.Parse(ss.ToString());

      gridviewModel.gridviewEntities obj = new gridviewModel.gridviewEntities();

      var c=from n in obj.menus where n.Rid==s select n;

      return c.ToList<gridviewModel.menu>();

   }

Thanks 

       shibashish mohanty