How to Execute function to refresh asp.net page according to time(30 seconds)

Question

How can we Reload or Refresh Asp.net page automatically according to time

For Example

Whats the best way to manage it

When User Click an asp.net button I want to execute a function which takes some paramter and execute for 30 seconds . After 30 seconds it stops executing function and return the data from sqlserver(db) and bind into grid so Only specific Region should get changed not whole page becuase i have 3 grids on page and 1 grid should get refreshed

Whats the best way to manage it