private void gridStack_MouseMove( object sender, System.Windows.Forms.MouseEventArgs e) { // Handles gridStack.MouseMove System.Windows.Forms.DataGrid.HitTestInfo hit; hit = gridStack.HitTest(e.X, e.Y); StackEntry stackentry = mStackArray[hit.Row]; string memberName; memberName = gridStack.TableStyles[0].GridColumnStyles[hit.Column].MappingName; this.ToolTip.SetToolTip(gridStack, stackentry.GetText(memberName)); }