How to show the error without mouse hover

ErrorProvider control do not support this property my itself, so i propose you three solutions to achieve it:

Create a Error list on the top of the page and show the description or the error messages in that list
Put a label along with Error provider, and when setting the the message in Error Provider then also set down the label.
Create a custom control for the same, which will be combination of both ErrorProvider and a label and expose some methods which will do the task of setting error message in both ErrorProvider along with label as mentioned in point 2.

Regards
AJ