Request from User:Now, if I change a data in my database, I want this to be updated in the text in the DGN file.
If changes are made to the database and would like to refresh the data in the design file, you can simply fence the file, reload the DAS by using the Load Displayable Attributes tool (use Fence toggle), and the text will update accordingly.
This video covers the Load Displayable Attributes" tool.
For additional information refer to Displayable Attributes
Connecting to MS Access Database from MicroStation Connect