why gridview is not visible when we run

Question

I'm adding a GridView & then showing data in it from a SQL Server database. The problem is that the GridView is not displaying in the browser with or without data.

 

<asp:GridView ID="grdLocation" runat="server" AutoGenerateColumns="False"
        onrowdatabound="grdLocation_RowDataBound"
        onrowdeleted="grdLocation_RowDeleted" Width="100%" CssClass="grid-view"
        EnableModelValidation="True" ViewStateMode="Enabled">
       <Columns>
           <asp:TemplateField HeaderText="Location Name">
               <ItemTemplate>
                   <asp:Label ID="lblShowLocationName" runat="server" Text='<%# Eval("Name") %>'></asp:Label>
               </ItemTemplate>
               <EditItemTemplate>
                   <asp:TextBox ID="txtEditLocationName" runat="server" Text='<%# Eval("Name") %>'></asp:TextBox>
                   <asp:RequiredFieldValidator ID="rfvLocationName" runat="server" ControlToValidate="txtEditLocationName" SetFocusOnError="true" ErrorMessage="*" ValidationGroup="LocationUpdate"></asp:RequiredFieldValidator>
                   <%--<asp:RegularExpressionValidator ID="rexvLocationNameEdit" runat="server" ControlToValidate="txtEditLocationName" SetFocusOnError="true" ValidationGroup="Location" ValidationExpression="^[a-zA-Z ]*$" ErrorMessage="Only Alphabets Allowed" Display="Dynamic"></asp:RegularExpressionValidator>--%>
               </EditItemTemplate>
               <HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" />
               <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" />
           </asp:TemplateField>
           <asp:TemplateField HeaderText="Location Code">
               <ItemTemplate>
                   <asp:Label ID="lblShowLocationCode" runat="server" Text='<%# Eval("Code") %>'></asp:Label>
               </ItemTemplate>
               <EditItemTemplate>
                   <asp:TextBox ID="txtEditLocationCode" runat="server" Text='<%# Eval("Code") %>'
                       ></asp:TextBox>

               </EditItemTemplate>
               <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" />
           </asp:TemplateField>
           <asp:TemplateField>
               <ItemTemplate>
                   <asp:ImageButton ID="imgBtnshow" runat="server" ToolTip="View"
                       CommandArgument='<%# Eval("LocationId") %>' ImageUrl="~/Images/file_edit.png"
                       onclick="imgBtnshow_Click" />
               </ItemTemplate>
               <EditItemTemplate>
                   <asp:ImageButton ID="imgBtnEdit" runat="server" CommandArgument='<%# Eval("LocationId") %>' ImageUrl="~/Images/buttonsave.png" OnClick="imgBtnEdit_Click" ValidationGroup="LocationUpdate" ToolTip="Update" />
                   <asp:ImageButton ID="imgBtnCancel" runat="server" ToolTip="Cancel"
                   ImageUrl="~/Images/1350368827_save_delete.png" onclick="imgBtnCancel_Click"/>
               </EditItemTemplate>
               <ItemStyle Width="50px" />
           </asp:TemplateField>
           <asp:TemplateField>
               <ItemTemplate>
                   <asp:ImageButton ID="imgBtnDelete" runat="server" CommandArgument='<%# Eval("LocationId") %>' ImageUrl="~/Images/delete-256.png" OnClick="imgBtnDelete_Click" OnClientClick="Confirm()" ToolTip="Delete"/>
               </ItemTemplate>
               <ItemStyle Width="50px" />
           </asp:TemplateField>

       </Columns>
    </asp:GridView>