I want the end product user to open the attributes, measure task and query the shapefile data using the DotSpatial library in C#.
I have dll with me but when I create the folder in solution and add the dll it doesn't show any change in the output.
You'll want to include DotSpatial.Plugins.Measure, and DotSpatial.Plugins.AttributeDataExplorer, both of which can be found in the Extension Manager. (See Finding and Installing the WebMap Extension for help with plugins.)
The former adds a measure tool, and the latter lets you view and filter attributes.