word-wrap is not a known CSS property name

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VB

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i'm trying to wrap a textbox but i'm getting that word-wrap is not a know css property name

well in fact it's working for a simple textbox but for a textbox in a gridview it's not working so how can i fix it?

that's my asp code:

<asp:TextBox style="width:10px;word-wrap:break-word;" id="txt" Runat="Server" Text="adfdafadfadfcvsgsgdasfsaghsgksfjghrwkkjgsfkglsfgsfgsfgsfadfdafadfadfcvsgsgdasfsaghsgksfjghrwkkjgsfkglsfgsfgsfgsfadfdafadfadfcvsgsgdasfsaghsgksfjghrwkkjgsfkglsfgsfgsfgsfadfdafadfadfcvsgsgdasfsaghsgksfjghrwkkjgsfkglsfgsfgsfgsfadfdafadfadfcvsgsgdasfsaghsgksfjghrwkkjgsfkglsfgsfgsfgsf" wrap="true" TextMode="MultiLine"/>

this textbox is wrapping but the following code is not working:

<pre lang="xml"><asp:TemplateField HeaderText="cnt_content">
                   <EditItemTemplate>
                            <asp:TextBox ID="cnt_content" runat="server" Text='<%# Bind("cnt_content") %>' style="width:800px;word-wrap:break-word;" wrap="true" TextMode="MultiLine"/>
                   </EditItemTemplate>
                   <ItemTemplate>
                       <asp:Label ID="cnt_content" runat="server" Text='<%# Bind("cnt_content") %>'></asp:Label>
                   </ItemTemplate>
                   <ItemStyle Width="800px" wrap="true" />
               </asp:TemplateField>