.Net C# howto convert DataReader to Dataset

public DataSet ConvertDataReaderToDataSet(OleDbDataReader reader)
{
DataSet dataSet = new DataSet();
DataTable schemaTable = reader.GetSchemaTable();
DataTable dataTable = new DataTable();

for(int cntr = 0; cntr < schemaTable.Rows.Count; ++cntr )
{
DataRow dataRow = schemaTable.Rows[cntr];
string columnName = dataRow["ColumnName"].ToString();
DataColumn column = new DataColumn(columnName,dataRow.GetType());
dataTable.Columns.Add(column);
}

dataSet.Tables.Add(dataTable);

while (reader.Read())
{
DataRow dataRow = dataTable.NewRow();
for(int cntr = 0; cntr < reader.FieldCount; ++cntr)
{
dataRow[cntr] = reader.GetValue(cntr);
}
}

return dataSet;
}