how to maintain error log table for the ui page errors

If you want to log the errors put your code into try-catch block and log the error in catch statement.

An example pseudo code;

try
{
 //your code in the page
}
catch(Exception ex)
{
  //open a DB connection
  //Insert the exception details to your table
  // close your connection after inserting
}

You can also use your global.asax file as well.
Here are some example links to give you an idea:
Create Simple Error Log Files using ASP.NET and C#[^]
Logging Error Details with ASP.NET Health Monitoring(C#)[^]
Event and Error Logging[^]


Beware here though. When you use try-catch it will swallow the exception so you might want to notify the user with a client-sided message box or something similar.

Good luck,
OI