Messsage	Action	Value
	EM_UNDO	Undoes the last edit	199
	EM_CANPASTE	Determines if the control can paste to the clipboard	1074
	EM_SETMODIFY	Sets or clears the control's edit flag	185
	EM_FINDTEXT	Finds text in a control	1080
	EM_EMPTYUNDOBUFFER	Resets the control's undo flag, making the control unable to undo	205
	EM_CANUNDO	Determines whether an edit can be undone	198
	EM_LINEFROMCHAR	Retrieves line number that contains the specified character offset	201
	EM_GETFIRSTVISIBLELINE	Determines the uppermost visible line in a control	206
	EM_GETLINECOUNT	Retrieves the number of lines in a multiline control	186
	EM_GETLINE	Retrieves a line of text from a control	196
	EM_GETMODIFY	Determines whether the contents of a control have been modified	184
	EM_LINEFROMCHAR	Retrieves the line number a specified number of characters from the beginning of the text	201
	EM_LINEINDEX	Retrieves the number of characters from the beginning of the text where a line starts	187
	EM_LINELENGTH	Returns the length of the specified line of text	193
	EM_LINESCROLL	Scrolls text vertically or horizontally	182
	EM_SCROLLCARET	Scrolls the caret into view in a control	183
	EM_SETTABSTOPS	Sets the tab stops in a multiline control	203

Table 2 Textbox Messages. EM stands for "Edit control Message," or messages for use with edit controls (also known as VB textboxes). This list is a representative subset of the Windows-defined messages for use with textboxes; there are many others defined. See them all using the Win 32 SDK. Most of these are located in the VB API Viewer.