I need to customize the connections in raddiagram just like the attached shape. i reviewed the forum and only find an example that change the color of the connection but i need a more complex connection as it is attached. how can i do that?
Let us start with that the RadDiagramConnection doesn't have built-in functionality which you can use to change its appearance as showed in the attached picture.
A possible approach which you can use is to take advantage of the (object) Content property of the RadDiagramConnection and place for example a Rectangle. You can take a look at the SetContent section in the Connections help article in our documentation where this property is further described. Then you can subscribe to the SizeChanged event of the connection and manually calculate its rotate angle and its width. This way you can reposition the rectangle on the connection when the connection position changed.
For your convenience, we have created a sample project demonstrating the explained above approach. Keep in mind that this custom code is just a suggestion and we cannot guarantee that it will work properly in all expected scenarios. You can test and modify the project to fit the desired scenario.
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