How to replace an element in html with a datalist ?

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ASP.NET

Hi all ,

I have an element in an html document and it is <%RESULT%> .So iam reading this html document into a string called input.And in the input iam replacing this element with a datalist and this is the code :

input.Replace("<%RESULT%>", DataListResults)

but it is telling me that datalist cannot be converted to string.So is there any other way to replace this element with a datalist.?

Thanks.