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DataTable dtNew = dt.Clone();
foreach (DataRow row in dt.Rows)
{
DataRow newRow = dtNew.NewRow();
foreach (DataColumn column in dt.Columns)
{
if (!column.ColumnName.Equals("inc_num"))
{
newRow[column.ColumnName] = row[column.ColumnName];
}
}
dtNew.Rows.Add(newRow);
}