Hi Kodeeswaran Duraisamy,
First, you need to add a UserControl to your project by following steps:
Right-click your project's name-> Add->User Control.
Run your project and then you can drag the UserControl from ToolBox to form.
Then you can use Control.Dock property to set UserControl borders are docked to form.
Such as:
userControl11.Dock = DockStyle.Top;
Best Regards,
Daniel Zhang
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