Preventing Fullpostback & Reg Ajax?

Jun 28, 2010

i have used ajax , but i am not very clear of its concepts

i just knw that it prevents full post back

1) frm where can i get a very clear concept for the use and purpose of ajax and how its to be used

2) i have a textbox with autocomplete extender and a button (button1)

button1 is in the updatepanel as i wanted tp prevent post back when i click button the datafrom the textbox is inserted in grid as the click event gave full post back i used updatepanel , now its wrking fine but the prblm is when i enter new datain textbox and fetech the deatils frm database full postback occurs i tried to put the autocomplete etext box in a update panel but its giving error.i need toprevent this post back

3) on the same button click at the end of the click process(ie after adding to grid)i need the autocomplete extetender text box shld be blank

i used textbox1.text="" but its nt working

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