C#

public class RtfWriter // Or whatever it's called
{
  public RtfWriter()
  {
    RtfHeader(); // Or use an initialization pattern like you are now
  }
  ~RtfWriter()
  {
    Dispose(false);
  }
  protected virtual void Dispose(bool disposing)
  {
    // 'disposing' is false to release unmanaged resources;
    // true to release both unmanaged and managed resources.
    if (disposing)
    {
      RtfEnd(); // Don't call if the finalizer was called
    }
  }
  void IDisposable.Dispose()
  {
    Dispose(true);
  }
}

IDataObject obj = Clipboard.GetDataObject();
DataTable table = new DataTable();
string data = string.Empty;
Char delim = ',';
if(obj.GetDataPresent(DataFormats.CommaSeparatedValue))
{
    StreamReader reader = new StreamReader((Stream)obj.GetData(DataFormats.CommaSeparatedValue));
    while(reader.Peek() > 0)
    {
        data = reader.ReadLine();
        string[] arr = data.Split(delim);   
        if(table.Columns.Count <= 0)
        {
            for(int i = 0; i < arr.GetUpperBound(0);i++)
                table.Columns.Add();
        }
        DataRow row = table.NewRow();
        for(int j = 0; j < arr.GetUpperBound(0);j++)
        {
            row[j] = arr.GetValue(j);
        }
        table.Row.Add(row);
    }
    reader.Close();
    dataGrid.DataSource = table.DefaultView();
}

IDataObject data = Clipboard.GetDataObject();
if (data != null)
{
  string csv = data.GetData("Csv") as string;
  if (csv != null)
  {
    using (StringReader reader = new StringReader(csv))
    {
      string line = null;
      while ((line = reader.ReadLine()) != null)
        // Continue processing...
    }
  }
}

CurrencyManager cm = (CurrencyManager)dataGrid1.BindingContext[
  dataGrid1.DataSource, dataGrid1.DataMember];
if (cm != null)
{
  IList list = cm.List;
  if (list is DataView)
  {
    DataTable dt = ((DataView)list).Table;
    foreach (/* line in the parsed csv file */)
      DataRow row = dt.LoadDataRow(line.Split(','), false);
  }
  // Other conditions...
}