HTML
<fieldset style="width:100%"><legend>Duplicates</legend>
<asp:RadioButton runat="server" ID="rbtn_over" GroupName="Imp" Text="Overwrite" style=" display:inline;" />
<br /><br />
<asp:RadioButton runat="server" ID="rbtn_skip" GroupName="Imp" Text="Skip" />
<br /><br />
<asp:CheckBox runat="server" ID="chk1" Text="Checkbox1" />
<br /><br />
<asp:CheckBox runat="server" ID="CheckBox1" Text="Checkbox1" />
</fieldset>
//CSS
input[type=radio], input.radio { float:left; clear:none; margin: 2px 8px 0 2px; }
input[type=checkbox], input.checkbox { float:left; clear:none; margin: 2px 8px 0 2px; }
//Result
<fieldset style="width:100%"><legend>Duplicates</legend>
<asp:RadioButton runat="server" ID="rbtn_over" GroupName="Imp" Text="Overwrite" style=" display:inline;" />
<br /><br />
<asp:RadioButton runat="server" ID="rbtn_skip" GroupName="Imp" Text="Skip" />
<br /><br />
<asp:CheckBox runat="server" ID="chk1" Text="Checkbox1" />
<br /><br />
<asp:CheckBox runat="server" ID="CheckBox1" Text="Checkbox1" />
</fieldset>
//CSS
input[type=radio], input.radio { float:left; clear:none; margin: 2px 8px 0 2px; }
input[type=checkbox], input.checkbox { float:left; clear:none; margin: 2px 8px 0 2px; }
//Result