System.ComponentModel.Container components = new System.ComponentModel.Container();
System.Windows.Forms.ToolTip toolTip = new System.Windows.Forms.ToolTip(components);
......
string[] toolTips = new string[] { "Open",
"New",
"Save",
"Cut",
"Copy",
"Paste"};
for (int i = 0; i < Controls.Length; i++)
toolTip.SetToolTip(Controls[i], toolTips[i]);