user-controls

What is the difference between a User Control Library and a Custom Control Library?

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I am just coming up to speed on WPF and would like to create a reusable WPF control. When I look at the options for creating projects in Visual Studio, I see “WPF User Control Library” and “WPF Custom Control Library”. It’s unclear to me what the difference is between them and my Google searches … Read more

“The Controls collection cannot be modified because the control contains code blocks”

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I am trying to create a simple user control that is a slider. When I add a AjaxToolkit SliderExtender to the user control I get this (*&$#()@# error: Server Error in “https://stackoverflow.com/” Application. The Controls collection cannot be modified because the control contains code blocks (i.e. `<% … %>`). Description: An unhandled exception occurred during … Read more