How to copy a datatable column from one table to another in c sharp...

DataTable class in .NET framework will help you. Herez an example to copy the columns of PresentAddress table to PermanantAddress table.

DataTable PresentAddress = new DataTable(); 
DataTable PermanantAdress = new DataTable(); 

foreach (DataRow sourcerow in PresentAddress .Rows)
{
    DataRow destRow = PermanantAdress.NewRow();
    destRow["Name"] = sourcerow["Nam"];
    destRow["Address"] = sourcerow["Addr"];
    PermanantAdress.Rows.Add(destRow);
}