The designer class must inherit the ControlDesignerBase. This is the base class for all widget designers. In the ResponsiveImageDesigner class, by overriding the LayoutTemplatePath property, you specify the template you are using. You must add a reference to the ImageField control added in the markup. By overriding GetScriptReference and GetScriptResources, you provide a reference to the corresponding client-side component.
In Visual Studio, perform the following:
EXAMPLE: For more information about the content of the file, see the ResponsiveImageDesigner.cs file of the downloaded sample project.
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