Net Framework 4.0 class, please check if Ajax Control Tool Kit and all reference is in correct version. 2) I found that using a Register command at the top of the ASCX file seemed to properly override the default behavior of the designer to pick the 4.0 location for the 3.5 control (I think that is the underlying issue, it is a 4.0 designer backwards compatible with 3.5). Deserialize Statement To Instance(IDesigner Serialization Manager manager, Code Statement statement) at System.
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However, every time I go back into editing and save, Visual Studio always changes it back to System.
When I go directly into the file and change it, it works.
Many designers used Microsoft Word and Adobe In Design together, but the unique formatting and hidden markup in Word often cause issues when you bring text into In Design.