Important properties, methods and events of ImageButton control : ImageButton « ASP.net Controls « ASP.NET Tutorial

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AccessKey:       a key that navigates to the ImageButton control.

AlternateText:   alternate text for the image (required for accessibility).

DescriptionUrl:  a link to a page that contains a detailed description of the image (required to make a complex image accessible).

CommandArgument: a command argument that is passed to the Command event.

CommandName:     command name that is passed to the Command event.

Enabled:         disable the ImageButton control.

GenerateEmptyAlternateText: set the AlternateText property to an empty string.

ImageAlign:      align the image relative to other HTML elements in the page. 
                 Possible values are AbsBottom, AbsMiddle, Baseline, Bottom, Left, 
                 Middle, NotSet, Right, TextTop, and Top.

ImageUrl:        URL to the image.

OnClientClick:   a client-side script that executes when the ImageButton is clicked.

PostBackUrl:     post a form to a particular page.

TabIndex:        tab order of the ImageButton control.

Focus:           set the initial form focus to the ImageButton control.

Click:           Raised when the ImageButton control is clicked.

Command:         Raised when the ImageButton control is clicked. 
                 The CommandName and CommandArgument are passed to this event.