تاریخ قبلا در پایگاه درج شده من نوع تاریخ رو به datetime و date تغییر دادم ، که مشکل حل نشد 

 <asp:GridView ID="ShopGrid" runat="server" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="shopid" DataSourceID="Shopds" PageSize="4" style="text-align: center" OnRowDataBound="ShopGrid_RowDataBound">                        <Columns>

                            <asp:TemplateField ShowHeader="False" HeaderText="ویرایش و حذف">

                                <EditItemTemplate>

                                    <asp:Button ID="Button1" runat="server" CausesValidation="True" CommandName="Update" Text="به روز رسانی" />

                                    &nbsp;<asp:Button ID="Button2" runat="server" CausesValidation="False" CommandName="Cancel" Text="لغو" />

                                </EditItemTemplate>

                                <ItemTemplate>

                                    <asp:Button ID="Button1" runat="server" CausesValidation="False" CommandName="Edit" Text="ویرایش" />

                                    &nbsp;<asp:Button ID="Button2" runat="server" CausesValidation="False" CommandName="Delete" Text="حذف" Width="51px" OnClientClick="return confirm('آیا از حذف مطمئن هستید؟');" />

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:BoundField DataField="shopid" HeaderText="کد" InsertVisible="False" ReadOnly="True" SortExpression="shopid" />

                            <asp:BoundField DataField="shopname" HeaderText="نام رستوران/فست فود" SortExpression="shopname" />

                            <asp:TemplateField HeaderText="نوع رستوران" SortExpression="shoptypeid">

                                <EditItemTemplate>

                                    <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="shoptypeds" DataTextField="shoptypename" DataValueField="shoptypeid" SelectedValue='<%# Bind("shoptypeid") %>'>

                                    </asp:DropDownList>

                                    <asp:SqlDataSource ID="shoptypeds" runat="server" ConnectionString="<%$ ConnectionStrings:OnlineResturansConnectionString %>" SelectCommand="SELECT * FROM [shoptype]"></asp:SqlDataSource>

                                </EditItemTemplate>

                                <ItemTemplate>

                                    <asp:Literal ID="Literal1" runat="server" Text='<%# shoptype(Eval("shoptypeid")) %>'></asp:Literal>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:TemplateField HeaderText="تاریخ عضویت" SortExpression="registerdate">

                                <EditItemTemplate>

                                    <asp:TextBox ID="TextBox2" runat="server" ReadOnly="True" Text='<%# Bind("registerdate") %>'></asp:TextBox>

                                </EditItemTemplate>

                                <ItemTemplate>

                                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("registerdate") %>'></asp:Label>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:TemplateField HeaderText="آدرس" SortExpression="address">

                                <EditItemTemplate>

                                    <asp:TextBox ID="TextBox1" runat="server" Height="50px" Text='<%# Bind("address") %>' TextMode="MultiLine"></asp:TextBox>

                                </EditItemTemplate>

                                <ItemTemplate>

                                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("address") %>'></asp:Label>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:BoundField DataField="phone" HeaderText="شماره تماس" SortExpression="phone" />

                            <asp:TemplateField HeaderText="جزئیات بیشتر">

                                <ItemTemplate>

                                    <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# Eval("shopid", "shopdetail.aspx?id={0}") %>' Text='<%# Eval("shopid", "جزئیات بیشتر") %>' Width="100px"></asp:HyperLink>

                                </ItemTemplate>

                            </asp:TemplateField>

                        </Columns>

                    </asp:GridView>

                    <asp:SqlDataSource ID="Shopds" runat="server" ConnectionString="<%$ ConnectionStrings:OnlineResturansConnectionString %>" DeleteCommand="DELETE FROM [shop] WHERE [shopid] = @shopid" InsertCommand="INSERT INTO [shop] ([shopname], [shoptypeid], [registerdate], [address], [phone]) VALUES (@shopname, @shoptypeid, @registerdate, @address, @phone)" SelectCommand="SELECT [shopid], [shopname], [shoptypeid], [registerdate], [address], [phone] FROM [shop] ORDER BY [shopname] DESC" UpdateCommand="UPDATE [shop] SET [shopname] = @shopname, [shoptypeid] = @shoptypeid, [registerdate] = @registerdate, [address] = @address, [phone] = @phone WHERE [shopid] = @shopid">

                        <DeleteParameters>

                            <asp:Parameter Name="shopid" Type="Int32" />

                        </DeleteParameters>

                        <InsertParameters>

                            <asp:Parameter Name="shopname" Type="String" />

                            <asp:Parameter Name="shoptypeid" Type="Byte" />

                            <asp:Parameter DbType="Date" Name="registerdate" />

                            <asp:Parameter Name="address" Type="String" />

                            <asp:Parameter Name="phone" Type="String" />

                        </InsertParameters>

                        <UpdateParameters>

                            <asp:Parameter Name="shopname" Type="String" />

                            <asp:Parameter Name="shoptypeid" Type="Byte" />

                            <asp:Parameter DbType="Date" Name="registerdate" />

                            <asp:Parameter Name="address" Type="String" />

                            <asp:Parameter Name="phone" Type="String" />

                            <asp:Parameter Name="shopid" Type="Int32" />

                        </UpdateParameters>

                    </asp:SqlDataSource>