Why can't I programatically set the value on my hidden field on a repeater?

I've had this strange proble开发者_如何学运维m come up. I have a RowDataBound event handler for a repeater control.

I have the code:

HiddenField hfIpAddressRangeId = (HiddenField)e.Row.FindControl("hfIpAddressRangeId");
hfIpAddressRangeId.Value = .IpAddressRangeId.ToString();

But when I look at the html the value of that control is not set. However when I set the value using inline C# such as

<asp:HiddenField runat="server" Value='<%# Eval("IpAddressRangeId ") %>' ID="hfIpAddressRangeId" ViewStateMode="Enabled" />

The value is being set. I'm not really sure why this won't work when I bind each datarow?

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It looks like IpAddressRangeId is a part of your datasource, hence the use of Eval in the second example. Have you tried this?:

HiddenField hfIpAddressRangeId = (HiddenField)e.Row.FindControl("hfIpAddressRangeId"); 
hfIpAddressRangeId.Value = DataBinder.Eval(e.Row.DataItem, "IpAddressRangeId").ToString();