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DataTable dt = new DataTable();
DataRow[] rows;
if (getdt.Columns.Count > 0)
{
    for (int j = 0; j < getdt.Columns.Count; j++)
    {
        string s = getdt.Columns[j].ColumnName + " not like '--%'";
        rows = getdt.Select(s);
    }
    for (int j = 0; j < 6; j++)
    {
        foreach (DataRow row in rows)
        {
            DataRow newRow = dt.NewRow();
            newRow[getdt.Columns[j].ColumnName] = row[getdt.Columns[j].ColumnName];
            dt.Rows.Add(newRow);
        }
    }
}