Use the Merge() method : DataSet : Database C# Source Code

    


using System;
using System.Data;
using System.Data.SqlClient;

class Merge
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");

    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();

    mySqlCommand.CommandText =
      "SELECT ID, FirstName, LastName, Address " +
      "FROM Customers " +
      "WHERE ID IN ('001', '002', '003')";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Customers");

    mySqlCommand.CommandText =
      "SELECT ID, FirstName, LastName, Address " +
      "FROM Customers " +
      "WHERE CustomerID IN ('008', '009')";
    DataSet myDataSet2 = new DataSet();
    mySqlDataAdapter.Fill(myDataSet2, "Customers2");

    mySqlCommand.CommandText =
      "SELECT TOP 5 ProductID, ProductName, UnitPrice " +
      "FROM Products " +
      "ORDER BY ProductID";
    DataSet myDataSet3 = new DataSet();
    mySqlDataAdapter.Fill(myDataSet3, "Products");

    mySqlConnection.Close();

    myDataSet.Merge(myDataSet2);

    myDataSet.Merge(myDataSet3, true, MissingSchemaAction.Add);

    foreach (DataTable myDataTable in myDataSet.Tables) {
      Console.WriteLine("\nReading from the " + myDataTable + "DataTable");
      foreach (DataRow myDataRow in myDataTable.Rows) {
        foreach (DataColumn myDataColumn in myDataTable.Columns) {
          Console.WriteLine(myDataColumn + "= " + myDataRow[myDataColumn]);
        }
      }
    }
  }
}