How to display text in HTML format in GridView?

I was working on GridView for displaying history of records. I realized that I need to highlight some keywords. I was wondering why GridView is not showing text in HTML format. I had a code like this:

<asp:gridview id="gvHistory" runat="server">
    <columns>
        <asp:boundfield datafield="OldValue" headertext="Old Value"/>
        <asp:boundfield datafield="NewValue" headertext="New Value"/>
        <asp:boundfield datafield="strWhen" headertext="Updated On"/>
        <asp:boundfield datafield="ByWhom" headertext="Updated By"/>
    </columns>
</asp:gridview>

Then I found that GridView has by default HTMLEncode=”True”

HTMLEncode: HTML-encodes a string and returns the encoded string.

HTML encoding makes sure that text is displayed correctly in the browser and not interpreted by the browser as HTML. For example, if a text string contains a less than sign (<) or greater than sign (>), the browser would interpret these characters as the opening or closing bracket of an HTML tag. When the characters are HTML encoded, they are converted to the strings & lt ; and & gt ;, which causes the browser to display the less than sign and greater than sign correctly.

Simple Solution for it is to make "False" to HTMLEncode attribute as follow:

<asp:gridview id="gvHistory" runat="server">
    <columns>
        <asp:boundfield datafield="OldValue" headertext="Old Value" 
HTMLEncode="false"/>
        <asp:boundfield datafield="NewValue" headertext="New Value" 
HTMLEncode="false"/>
        <asp:boundfield datafield="strWhen" headertext="Updated On"/> 
        <asp:boundfield datafield="ByWhom" headertext="Updated By"/> 
    </columns>
</asp:gridview>

By making HTMLEncode attribute to "False", You can allow text in HTML Format.