You can use TabControl's MouseMove event to detect whether your mouse is present on any tab and then can select it:
private void tabControl1_MouseMove(object sender, MouseEventArgs e)
{
Rectangle mouseRect = new Rectangle(e.X, e.Y, 1, 1);
for (int i = 0; i < tabControl1.TabCount; i++)
{
if (tabControl1.GetTabRect(i).IntersectsWith(mouseRect))
{
tabControl1.SelectedIndex = i;
break;
}
}
}
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