Sharepoint Webpart in a MasterPage

I created a Custom webpart in which on user logged on it has to check whether the user entry is there in a Custom list, if exists redirect to the accessed page.

im writing in OnPreRender(EventArgs e)....when i place this webpart in a page..it is perfectly working...But, when placed in a masterpage it is not working.....

im not getting if i'm placing the webpart in a wrong place.

Please do help me on this.

Th开发者_如何学Goanks in advance.

As far as I know, you can't place web parts on master pages. We struggled with that for a while trying to solve our navigation issues.