[Solved] Change Date Format with DataBinder Eval function in ASP.Net

sorry its my mistake i forgot to add closing tag for label.. it resolved

<asp:Label ID="lbl_date" runat="server" Text='<%# Convert.ToDateTime(Eval("dt_pub")).ToString("dd/MM/yyyy") %>'></asp:Label>

Here I have created sample using your code.

HTML

<asp:GridView ID="gv" runat="server">
    <Columns>
        <asp:TemplateField HeaderText="Pub Date">
            <ItemTemplate>
                <asp:Label ID="lbl_date" runat="server" Text='<%# Convert.ToDateTime(Eval("dt_pub")).ToString("dd/MM/yyyy") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("dt_pub");
        dt.Rows.Add("2015-02-02");
        gv.DataSource = dt;
        gv.DataBind();
    }
}

Screenshot