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windows listbox help

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i am trying to delete every thing in a list box with this function i want all the lines deleted at once i do not want to have to press the button three times any suggestions please i am new to windows programming
void vRemoveText()
	int Line;
	// determine number of items in listbox
	Line = SendMessage(hLB_Output, LB_GETCOUNT, 0, 0);
	// add string to the listbox
	for (int x = 0; x < Line; x++) 
		SendMessage(hLB_Output, LB_DELETESTRING, Line-1, 0);

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