Hi
I hope that you are knowing the database mapping concept of EF. If not then please see my previous post How to fill gridview using EF?

For doing CRUD operation using EF, we have to do like this
srep1: Take gridview,Lable,Hidden field asp.net control and design the page like above

<div>

<asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="False" AllowPaging="true"
CellPadding="4" ForeColor="#333333" GridLines="None" Width="417px"
onpageindexchanging="Gridview1_PageIndexChanging"
onrowcommand="Gridview1_RowCommand"
onrowdeleting="Gridview1_RowDeleting" onrowediting="Gridview1_RowEditing">
<RowStyle BackColor="#E3EAEB" />
<Columns>
<asp:TemplateField HeaderText="SI.No">
<ItemTemplate>
<%#Container.DataItemIndex+1 %>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="EmpName" DataField="EmpName" />
<asp:BoundField HeaderText="EmpSal" DataField="EmpSal" />
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:LinkButton ID="lnkEdit" runat="server" Text="Edit" CausesValidation="false" CommandName="Edit" CommandArgument='<%# Eval("Id") %>’ OnClientClick="return confirm(‘Are you sure?’)" />
<asp:LinkButton ID="LinkDelete" runat="server" Text="Delete" CausesValidation="false" CommandName="Delete" CommandArgument='<%# Eval("Id") %>’ OnClientClick="return confirm(‘Are you sure?’)" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#7C6F57" />
<AlternatingRowStyle BackColor="White" />

</asp:GridView>
<asp:HiddenField ID="HiddenField1" runat="server" />

</div>

Step2: Write the code in code behind page like this

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
fillGrid();
}

//This code is used for fetch data from database
protected void fillGrid()
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{
var query = from m in TE.tblEmp
orderby m.Id descending
select m;
Gridview1.DataSource = query;
Gridview1.DataBind();
}
}

protected void BtnSubmit_Click(object sender, EventArgs e)
{
if (BtnSubmit.Text == "Submit")
{
SaveEmpData();

fillGrid();
}
else if (BtnSubmit.Text == "Update")
{
UpdateEmpRecord();
fillGrid();

}

}

//This code is used for Update functionality
private void UpdateEmpRecord()
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{
int Id1=Convert.ToInt32(HiddenField1.Value);
var query = (from m in TE.tblEmp
where m.Id==Id1
select m).First();

query.EmpName = txtEmpName.Text;
query.EmpSal = txtEmpSal.Text;
TE.SaveChanges();
lblmsg.Text = "Data has been updated Sucessfully";
BtnSubmit.Text = "Submit";
txtEmpName.Text = "";
txtEmpSal.Text = "";
}

}

// This code is used for save functionality
private void SaveEmpData()
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{

TestModel.tblEmp objEmp = new TestModel.tblEmp();
objEmp.EmpName = txtEmpName.Text;
objEmp.EmpSal = txtEmpSal.Text;
TE.AddTotblEmp(objEmp);
TE.SaveChanges();
lblmsg.Text = "Data has been inserted sucessfully";
txtEmpName.Text = "";
txtEmpSal.Text = "";
}

}

protected void Gridview1_RowCommand(object sender, GridViewCommandEventArgs e)
{
// This code is used for Delete functionality

if (e.CommandName == "Delete")
{
using(TestModel.TestEntities TE=new TestModel.TestEntities())
{
int id1 = Convert.ToInt32(e.CommandArgument);
var user = TE.tblEmp.First(m => m.Id == id1);
TE.DeleteObject(user);
TE.SaveChanges();
fillGrid();
lblmsg.Text = "";
txtEmpName.Text = "";
txtEmpSal.Text = "";

}

}

//This code is used for fetching particular row of gridview and dispaly on
// respective textbox field

else if (e.CommandName == "Edit")
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{
int id1 = Convert.ToInt32(e.CommandArgument);
var Empinfo = GetEmpInfo(id1);
txtEmpName.Text= Empinfo[0].EmpName.ToString();
txtEmpSal.Text = Empinfo[0].EmpSal.ToString();
HiddenField1.Value= Empinfo[0].Id.ToString();
BtnSubmit.Text = "Update";
}
}

}
protected void Gridview1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{

}
protected void Gridview1_RowEditing(object sender, GridViewEditEventArgs e)
{

}
//This code is used for paging
protected void Gridview1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
Gridview1.PageIndex = e.NewPageIndex;
fillGrid();

}

private List<TestModel.tblEmp> GetEmpInfo(int Id)
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{
return (from m in TE.tblEmp
where m.Id == Id
select m).ToList();
}
}

}

Hi
Here is some few steps to do this task

Note: I have tested this code with asp.net 3.5 sp1, In asp.net 4.0 also process is same.

Step1: Go to solution Explore, then right click then add new item like this

Step2: Click on next like this

Step3: Select the Exact database and click on next like this

Step4: Select your table name like this

Step5: Then you will get Model.edmx file like this

Step6:Take one gridview asp.net control in default page and write the code in code behind page like this

protected void Page_Load(object sender, EventArgs e)
{
fillGrid();
}

//This code is used for fetch data from database
protected void fillGrid()
{
using (TestModel.TestEntities TE = new TestModel.TestEntities())
{
var query = from m in TE.tblEmp
orderby m.Id descending
select m;
Gridview1.DataSource = query;
Gridview1.DataBind();
}
}