Validate textbox inside gridview at edit mode ?

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ASP.NET

Hi all ,

I am trying to validate a textbox at edit mode inside a gridview from javascript but did not find a way.

Here is my code:

<asp:GridView ID="GridView1" runat="server" Width="100%" AutoGenerateColumns="False"
            DataKeyNames="News_Id" DataSourceID="ods_news">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButton1" runat="server" CommandName="edit" ValidationGroup="ss">edit</asp:LinkButton>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:LinkButton ID="LinkButton2" runat="server" ValidationGroup="ss" CommandName="update" OnClientClick="GetCompanyText();">update</asp:LinkButton>
                        <asp:LinkButton ID="LinkButton3" runat="server" CommandName="cancel">cancel</asp:LinkButton>
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="News_Id" HeaderText="News_Id" InsertVisible="False" ReadOnly="True"
                    SortExpression="News_Id" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("News_Title") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server" ValidationGroup="ss" Text='<%# Bind("News_Title") %>'></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Required" ControlToValidate="TextBox1" ValidationGroup="ss"></asp:RequiredFieldValidator>
                    </EditItemTemplate>
                </asp:TemplateField>
                <%--  <asp:BoundField DataField="News_Title" HeaderText="News_Title" SortExpression="News_Title" />--%>
                <asp:BoundField DataField="News_Brief" HeaderText="News_Brief" SortExpression="News_Brief" />
                <asp:BoundField DataField="News_Text" HeaderText="News_Text" SortExpression="News_Text" />
                <asp:BoundField DataField="News_Date" HeaderText="News_Date" SortExpression="News_Date" />
                <asp:BoundField DataField="News_Image" HeaderText="News_Image" SortExpression="News_Image" />
                <asp:CheckBoxField DataField="News_IsActive" HeaderText="News_IsActive" SortExpression="News_IsActive" />
                <asp:BoundField DataField="News_Sort" HeaderText="News_Sort" SortExpression="News_Sort" />
            </Columns>
        </asp:GridView>

So on the linkbutton1 click event i want to call a javascript function that gets the value of textbox .