having problem in gridview

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ASP.NET

i have make gridview from and then right the code to take the data from database.
but this is only showing gridview and column name bu there is no data
please help me with that.

<asp:GridView ID="GridView1" runat="server"
           onrowcommand="GridView1_RowCommand" onrowdeleted="GridView1_RowDeleted"
           onrowediting="GridView1_RowEditing" onrowupdated="GridView1_RowUpdated"
           onselectedindexchanged="GridView1_SelectedIndexChanged"
           AutoGenerateColumns="False" onrowcreated="GridView1_RowCreated"
           style="margin-bottom: 0px">
           <Columns>
           <asp:TemplateField HeaderText="Rack No">
           <EditItemTemplate>
               <asp:TextBox ID="TextBoxEditrackno" runat="server" Text='<%# Bind("rackno") %>'/>
           </EditItemTemplate>
           <%--<ItemTemplate>
               <asp:Label ID="LabelRackNo" runat="server" Text='<%# Bind("Rack No") %>'/>
           </ItemTemplate>--%>
           <FooterTemplate>
               <asp:TextBox ID="TextBoxrackno" runat="server"/>
           </FooterTemplate>
       </asp:TemplateField >
       <asp:TemplateField HeaderText="Rack Name">
           <EditItemTemplate>
               <asp:TextBox ID="TextBoxEditrname" runat="server" Text='<%# Bind("rname") %>'/>
           </EditItemTemplate>
           <%--<ItemTemplate>
               <asp:Label ID="Labelrname" runat="server" Text='<%# Bind("rname") %>'/>
           </ItemTemplate>--%>
           <FooterTemplate>
               <asp:TextBox ID="TextBoxrname" runat="server"/>
           </FooterTemplate>
       </asp:TemplateField >
       <asp:TemplateField HeaderText="Quantity">
           <EditItemTemplate>
               <asp:TextBox ID="TextBoxEditqty" runat="server" Text='<%# Bind("qty") %>'/>
           </EditItemTemplate>
           <%--<ItemTemplate>
               <asp:Label ID="Labelqty" runat="server" Text='<%# Bind("qty") %>'/>
           </ItemTemplate>--%>
           <FooterTemplate>
               <asp:TextBox ID="TextBoxrqty" runat="server"/>
           </FooterTemplate>
       </asp:TemplateField >

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

        }
        private void binddata()
        {
            string connstring = @"Data Source=LENOVO-41B3F2CE\SQLEXPRESS;Initial Catalog=IMS;Integrated Security=True;Pooling=False";
            string query = "SELECT * FROM ['ISB VAS Nodes$']";
            SqlDataAdapter da = new SqlDataAdapter(query, connstring);
            DataTable dt = new DataTable();
            da.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }