Get a value from Web_Edit

How to get a value from the Web_edit in .Net application?
My application shows "0" in some web_edit, I have to capture those web_edit then need to give value for those.

Following is my piece of code in Ajax (Click and Script:

web_edit_field("SELLINGRATE",
Snapshot=t24.inf,
DESCRIPTION,
Type=text,
Name=SELLINGRATE,
Ordinal=396,
ACTION,
SetValue=56.95,
LAST);
Pls provide solution,
Thanks.