Right-click on the custom surface of your report and click Report Properties... Click the References button, click Add in Add or remove assemblies and add System.Web from the .NET options.
Select the Code option and add the following code:
Function Decode(ByVal EncodedString AS String) AS String Return System.Web.HttpUtility.HTMLDecode(EncodedString) End Function
For your field value, use the expression:
=Code.Decode(Fields!MyField.Value)
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