Nulll in GridView EVAL Calling ServerSide Method In Item Template

<asp:GridView ID="GridView1" runat="server" 
              DataSourceID="SqlDataSource1" 
              AutoGenerateColumns="false">

<Columns>
<asp:BoundField ShowHeader="true" DataField="ID" 
                              HeaderText="ID" />
<asp:TemplateField HeaderText="Name">

<ItemTemplate>
<asp:Label ID="Label1" runat="server" 
           Text='<%# CheckNull(Eval("Name")) %>'>
</asp:Label>

</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Location">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" 
           Text='<%# CheckNull(Eval("Location")) %>'>

</asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView> 

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.CS PAGE 

protected string CheckNull(object objGrid)
    {
        if (object.ReferenceEquals(objGrid, DBNull.Value))
        {
            return "No Record Found";
        }
        else
        {
            return objGrid.ToString();
        }
}

DateTime Format in GridView ItemTemplate In Asp.net C#

<asp:TemplateField>

<ItemTemplate>

<asp:Label ID="lblDate" runat="server" Text='<%# Eval("Date", "{0:dd/MM/yyyy}")%>' ></asp:Label>

</ItemTemplate>

</asp:TemplateField>

Refresh Page Issue in ASP.Net

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack) // If page loads for first time
    {
        // Assign the Session["update"] with unique value
        Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); 
        //=============== Page load code =========================




        //============== End of Page load code ===================
    }
}

protected void btnDisplay_Click(object sender, EventArgs e)
{ 
    // If page not Refreshed
    if (Session["update"].ToString() == ViewState["update"].ToString())
    {
        //=============== On click event code ========================= 

        lblDisplayAddedName.Text = txtName.Text;

        //=============== End of On click event code ==================

        // After the event/ method, again update the session 

        Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); 
    }
    else // If Page Refreshed
    {
        // Do nothing 
    }
}

protected override void OnPreRender(EventArgs e)
{
    ViewState["update"] = Session["update"];
}

MVC 3 Razor TextBox max length

@model MvcApplication.Models.Models.DemoModel

@Html.TextBoxFor(model => model.Password, new { maxlength = 10 })