How to Achieve this event fire

hi

i need How to fire Image button event from textbox keypress web application

I am design my asp.net page like this Textbox after imagebutton imagebutton
write the methods for save the records i need

when i will type textbox value press entry key i need fire the image button
automatically how will do this or

my image button code like this

protected void Save_Click(object sender, ImageClickEventArgs e)
{
===} here my save record code
}
or how to textbox change event fire this image button events
how will do this
i know web application no need
because easy to type to client so

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Regards
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