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Hi all,

Try this example to Change FontSize with Gridview According to Condition

add this CSS Style in your page

    <style type="text/css">   
    .Small   
    {       
    font-size: small;   
    }   
    .Large   
    {       
    font-size: large;   
    }
    </style>

In Gridview ItemTemplate

<asp:TemplateField HeaderText="Description" SortExpression="Description">
           <ItemTemplate>
               <asp:Label ID="Label1" runat="server" Text='<%# Bind("Description") %>'

 CssClass='<%# (Convert.ToString(Eval("Description")).Length > 30)? "Small": "Large"%>'></asp:Label>
           </ItemTemplate>
</asp:TemplateField>

and there is another way to do the same

<asp:TemplateField HeaderText="Description" SortExpression="Description">
          <ItemTemplate>
             <asp:Label ID="Label1" runat="server" Text='<%# Bind("Description") %>'

 Font-Size='<%# (Eval("Description").ToString().Length > 30) ? FontUnit.XSmall : FontUnit.Small %>'></asp:Label>
          </ItemTemplate>
</asp:TemplateField>

Sharing is Caring,
Danish Kharadi.