<asp:GridView runat="server" ID="GridView1" AutoGenerateColumns="false" 
    onrowediting="GridView1_RowEditing" onrowupdating="GridView1_RowUpdating">
    <Columns>
        <asp:TemplateField>
            <HeaderTemplate>Time</HeaderTemplate>
            <ItemTemplate>
                <%#Eval("Time", "{0:yyyy/MM/dd}") %>
            </ItemTemplate>
            <EditItemTemplate>
                <eo:DatePicker runat="server" ID="DatePicker1" ControlSkinID="None" 
                    DayCellHeight="16" DayCellWidth="19" DayHeaderFormat="FirstLetter" 
                    DisabledDates="" OtherMonthDayVisible="True" SelectedDates="" 
                    TitleLeftArrowImageUrl="DefaultSubMenuIconRTL" 
                    TitleRightArrowImageUrl="DefaultSubMenuIcon" VisibleDate="2009-11-01">
                    <TodayStyle CssText="font-family: tahoma; font-size: 12px; border-right: #bb5503 1px solid; border-top: #bb5503 1px solid; border-left: #bb5503 1px solid; border-bottom: #bb5503 1px solid" />
                    <SelectedDayStyle CssText="font-family: tahoma; font-size: 12px; background-color: #fbe694; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                    <DisabledDayStyle CssText="font-family: tahoma; font-size: 12px; color: gray; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                    <PickerStyle CssText="font-family:Courier New; padding-left:5px; padding-right: 5px;" />
                    <CalendarStyle CssText="background-color: white; border-right: #7f9db9 1px solid; padding-right: 4px; border-top: #7f9db9 1px solid; padding-left: 4px; font-size: 9px; padding-bottom: 4px; border-left: #7f9db9 1px solid; padding-top: 4px; border-bottom: #7f9db9 1px solid; font-family: tahoma" />
                    <TitleArrowStyle CssText="cursor:hand" />
                    <DayHoverStyle CssText="font-family: tahoma; font-size: 12px; border-right: #fbe694 1px solid; border-top: #fbe694 1px solid; border-left: #fbe694 1px solid; border-bottom: #fbe694 1px solid" />
                    <MonthStyle CssText="font-family: tahoma; font-size: 12px; margin-left: 14px; cursor: hand; margin-right: 14px" />
                    <TitleStyle CssText="background-color:#9ebef5;font-family:Tahoma;font-size:12px;padding-bottom:2px;padding-left:6px;padding-right:6px;padding-top:2px;" />
                    <OtherMonthDayStyle CssText="font-family: tahoma; font-size: 12px; color: gray; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                    <DayHeaderStyle CssText="font-family: tahoma; font-size: 12px; border-bottom: #aca899 1px solid" />
                    <DayStyle CssText="font-family: tahoma; font-size: 12px; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                </eo:DatePicker>
            </EditItemTemplate>
        </asp:TemplateField>            
        <asp:CommandField EditText="Edit" ShowEditButton="true" />            
    </Columns>
</asp:GridView>
<asp:Label runat="server" ID="Label1">
</asp:Label>

protected void Page_Load(
    object sender, EventArgs e)
{
    if (!Page.IsPostBack)
        BindGrid();
}

private void BindGrid()
{
    //This sample always create a DataTable from
    //memory. You will need to change this part to
    //load data from your DB
    DataTable table = new DataTable();
    table.Columns.Add(new DataColumn("Time", typeof(DateTime)));
    table.Rows.Add(DateTime.Today);
    table.Rows.Add(DateTime.Today.AddDays(1));
    GridView1.DataSource = table;
    GridView1.DataBind();
}

protected void GridView1_RowEditing(
    object sender, GridViewEditEventArgs e)
{
    //Entering edit mode
    GridView1.EditIndex = e.NewEditIndex;
    BindGrid();
}

protected void GridView1_RowUpdating(
    object sender, GridViewUpdateEventArgs e)
{
    //Get the new date user has entered
    GridViewRow row = GridView1.Rows[e.RowIndex];
    EO.Web.DatePicker datePicker = 
        (EO.Web.DatePicker)row.FindControl("DatePicker1");

    //Here we use a Label to display the new 
    //date for demonstration purpose. You will
    //need to change this code to save the
    //changes into your DB
    Label1.Text = datePicker.SelectedDate.ToString();

    //Cancel edit mode and rebind the Grid.
    //Because the sample code does not change
    //the data source, you will see the Grid
    //displays the original date again. However
    //once you change the code to load/save
    //data from and to your DB, the Grid should
    //work fine
    GridView1.EditIndex = -1;
    BindGrid();
}