Use the ToolTip button. Like.
System.Windows.Forms.ToolTip ToolTip1 = new System.Windows.Forms.ToolTip();
ToolTip1.SetToolTip(this.Button1, "Button Info");
Or you can:
Add a ToolTip control to your form, name it ToolTip1.
Add the text for the tooltip to the "ToolTip on ToolTip1" property of the button.
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