Read the requirements. They are very detailed and clear. Download the sample project and ensure you are comfortable enough with Winforms development to be able to implement the requests.
What I need delivered:
In the attached .Net 4.7.2 project goui, you will see a datagridview control called Controls/[login to view URL]
There is something wrong with the vertical scrollbar painting on the DarkDataGridView control. If you add enough items to the datagridview, even if you do a refresh() on the control, the vertical scrollbar height is wrong. If you resize the form, the scrollbar instantly repaints correctly.
The example project shows this issue.
I have read your project description and checked the sample project that you have shared. the vertical scroll bar does not appear correctly. I am able to fix that. I am looking forward your response to discuss further