第一种：
<HTML> <HEAD>
<TITLE> New Document </TITLE>
<style type="text/css">
.aa{
display: block;
width: 200px;
overflow: hidden;
white-space: nowrap;
-o-text-overflow: ellipsis;
text-overflow: ellipsis;
}
</style>
</HEAD>
<BODY>
<div class="aa">aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</div>
</BODY>
</HTML>
第二种:
<asp:TemplateField>
<ItemTemplate>
<%# Eval("About").ToString().SubString(0,20) + "…" %>
</ItemTemplate>
</asp:TemplateField>
word-break:keep-all;不换行