//<summary>
       /// Routine to filter first table and replace exiting table with filtered records.
       // </summary>
       // <param name="sourceSet">Dataset instance to be manipulated</param>\n
      private void _FilterAndInsert(DataSet sourceSet)
       {
           ///Apply your filter clauses in Select() function parameter
           DataRow[] rows = sourceSet.Tables[0].Select("filter clauses here...");
           ///Get the structure of source table
           DataTable tempTable = sourceSet.Tables[0].Clone();
           ///Add the filtered rows in temp table
           foreach (DataRow row in rows)
           {
               tempTable.Rows.Add(row.ItemArray);
           }
           tempTable.AcceptChanges();
           ///Create new dataset
           DataSet resultSet = new DataSet();
           ///Add temp table at first index or modify this code sequence as you require
           resultSet.Tables.Add(tempTable);
           for (int index = 1; index < sourceSet.Tables.Count; index++)
           {
               ///Set the copy of source table in local instance
               DataTable tableToAdd = sourceSet.Tables[index].Copy();
               ///Remove from source to avoid any exceptions
               sourceSet.Tables.RemoveAt(index);
               ///Add the copy to result set
               resultSet.Tables.Add(tableToAdd);
           }
           ///Set the copy to source table from result set
           sourceSet = resultSet.Copy();
       }

ADO.NET使您可以创建DataTable对象并将其添加到现有DataSet中.您可以使用PrimaryKey和Unique属性为DataTable设置约束信息.

有关更多信息，请检查此

http://msdn.microsoft.com/en-us/library/aeskbwf7％28v = vs.80％29.aspx [ ^ ]

ADO.NET enables you to create DataTable objects and add them to an existing DataSet. You can set constraint information for a DataTable by using the PrimaryKey and Unique properties.

For more information check this

http://msdn.microsoft.com/en-us/library/aeskbwf7%28v=vs.80%29.aspx[^]