Vaildation Summary does not work it does not show error message

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C#

ASP.NET

Gridview

validation

<asp:GridView ID="GrdCompany" runat="server" AutoGenerateColumns="False" DataKeyNames="company_id"

OnRowCancelingEdit="GrdCompany_RowCancelingEdit" OnRowDataBound="GrdCompany_RowDataBound"
OnRowEditing="GrdCompany_RowEditing" OnRowUpdating="GrdCompany_RowUpdating" OnRowCommand="GrdCompany_RowCommand"
ShowFooter="True" OnRowDeleting="GrdCompany_RowDeleting" BackColor="White" BorderColor="#D1B271" BorderStyle="None" BorderWidth="1px"
CellPadding="4">
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" BorderColor="#D1B271" />
<RowStyle BackColor="White" ForeColor="#000000" BorderColor="#D1B271"/>
<Columns>
<asp:TemplateField HeaderText="CompanyName" SortExpression="Company_name">
<EditItemTemplate>
<asp:TextBox ID="txtCompName" runat="server" Text='<%# Eval("company_name") %>'></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" ValidationGroup="update"
runat="server" ControlToValidate="txtCompName" ErrorMessage="Please enter ResourceName" Text="*" Display="Static"></asp:RequiredFieldValidator>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewCompName" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="ReqNewname" runat="server" ValidationGroup="save"
ControlToValidate="txtNewCompName" ErrorMessage="Please enter ResourceName" Text="*" Display="Static"></asp:RequiredFieldValidator>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblCompanyName" runat="server" Text='<%# Bind("company_name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Address Line1">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_address1" runat="server" Text='<%# Bind("company_address1") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_address1" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblAddress1" runat="server" Text='<%# Bind("company_address1") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Address Line2" SortExpression="State">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_address2" runat="server" Text='<%# Bind("company_address2") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_address2" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lbladdress2" runat="server" Text='<%# Bind("company_address2") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="City" SortExpression="company_city">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_city" runat="server" Text='<%# Bind("company_city") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_city" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblcity" runat="server" Text='<%# Bind("company_city") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="State" SortExpression="company_state">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_state" runat="server" Text='<%# Bind("company_state") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_state" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblState" runat="server" Text='<%# Bind("company_state") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Country" SortExpression="company_country">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_country" runat="server" Text='<%# Bind("company_country") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_country" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblcountry" runat="server" Text='<%# Bind("company_country") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="PinCode" SortExpression="company_pin_code">
<EditItemTemplate>
<asp:TextBox ID="txtcompany_pin_code" runat="server" Text='<%# Bind("company_pin_code") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewcompany_pin_code" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblpincode" runat="server" Text='<%# Bind("company_pin_code") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="modified_by" SortExpression="modified_by" Visible="false">
<EditItemTemplate>
<%--<asp:TextBox ID="txtmodified_date" runat="server" Text='<%# Bind("modified_date") %>'></asp:TextBox>--%>
</EditItemTemplate>
<FooterTemplate>
<%-- <asp:TextBox ID="txtmodified_date" runat="server"></asp:TextBox>--%>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblmodified_by" runat="server" Text='<%# Bind("modified_by") %>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="modified_date" SortExpression="modified_date" Visible="false">
<EditItemTemplate>
<%--<asp:TextBox ID="txtmodified_date" runat="server" Text='<%# Bind("modified_date") %>'></asp:TextBox>--%>
</EditItemTemplate>
<FooterTemplate>
<%-- <asp:TextBox ID="txtmodified_date" runat="server"></asp:TextBox>--%>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblmodified_date" runat="server" Text='<%# Bind("modified_date") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="" ShowHeader="False" >
<EditItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update"
Text="Update" ValidationGroup="update" ></asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel"
Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<FooterTemplate>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="true" CommandName="AddNew"
Text="Add New" ValidationGroup="save"></asp:LinkButton>
</FooterTemplate>
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit"
Text="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="" ShowDeleteButton="True" ShowHeader="True" />
</Columns>
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" BorderColor="#D1B271" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" BorderColor="#D1B271" />
<HeaderStyle BackColor="#D1B271" Font-Bold="True" ForeColor="#000000" HorizontalAlign="Center" BorderColor="#D1B271"/>

</asp:GridView>
<asp:ValidationSummary runat="server" ValidationGroup="drodownlists" ID="update" DisplayMode="BulletList" EnableClientScript="true" />
<asp:ValidationSummary runat="server" ValidationGroup="drodownlist" ID="save" DisplayMode="BulletList" EnableClientScript="true" />