public void Add_DataColumn3()
{
DataTable dt = new DataTable();
DataColumn col = new DataColumn("col1", Type.GetType("System.String"));
dt.Columns.Add(col);
Assert.Throws<DuplicateNameException>(() =>
{
DataColumn col1 = new DataColumn("col1", Type.GetType("System.String"));
dt.Columns.Add(col1);
});
}