Asp.net and c#

How to upload large size image in ASP.NET I have to develop a asp.net application where user should have facility to upload big size images, document.  I am getting error when i upload more that 4 MB file. please help me to solve this problem. 

How to make more than one default button in asp.net (Enter Key Problem) I have 2 buttons on my asp.net page. First one is for search and second one is login.  When I enter user id and password and hit on the enter button, it executes the search button. it is not executing login button.  When i enter user id and password and hit enter key login button should execute as well as enter keyword in search box then search button should execute.