Evaluate with conditions

if you want to test against a condition and two possible results and return boolean when databinding then this is quite useful. You can also use this is your code behind which makes it look less messy i.e. with anonymous types <%# Eval("yourfield") == null ? String.Empty : Eval("yourfield")%>

Hide a nested repeater with no items

If you want to hide a nested repeater, its quite simple really and useful when you have several repeaters with nested data and the same id. Just be aware that this may need some tinkering around with multiple repeaters. Add the itemdatabound event and use something along the following lines: protected void YourRepeater_ItemDataBound(object sender, EventArgs e) { Repeater repeater = sender as Repeater; if (repeater.Items.Count > 0) repeater.Visible = true; } Note: Make sure your nested repeated has visible=false as you dont want it to show if there are no items.

FIX: A potentially dangerous Request.Form value was detected from the client

If you are having a problem with using a wysiswyg editor for example then this can fix the "A potentially dangerous Request.Form value was detected from the client" error for a specific file/page, this is useful because you don't want to lose the layers of security provided to other pages. This should be put under in web.config. <location path="Admin/Pages/EditPage.aspx">
<system.web>
<httpRuntime requestValidationMode="2.0" />
<pages validateRequest="false" />
</system.web>
</location> Hopefully this will help