public void CloneExtendedProperties()
{
DataTable t1 = new DataTable("t1");
DataColumn c1 = t1.Columns.Add("c1");
c1.ExtendedProperties.Add("Company", "Xamarin");
DataTable t2 = t1.Clone();
Assert.Equal("Xamarin", t1.Columns["c1"].ExtendedProperties["Company"]);
Assert.Equal("Xamarin", t2.Columns["c1"].ExtendedProperties["Company"]);
}