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

class DataViewExample
{
static void Main()
{
string connString = “server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI”;
string sql = @”select * from employee”;
SqlConnection conn = new SqlConnection(connString);

try {
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = new SqlCommand(sql, conn);

DataSet ds = new DataSet();
da.Fill(ds, “employee”);

DataTable dt = ds.Tables[“employee”];

DataView dv = new DataView(dt,”lastname = 'Z'”, “lastname”, DataViewRowState.CurrentRows);

foreach (DataRowView drv in dv)
{
for (int i = 0; i < dv.Table.Columns.Count; i++){ Console.Write(drv[i] + " "); } } } catch(Exception e) { Console.WriteLine("Error: " + e); } finally { conn.Close(); } } } [/csharp]

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
Example23_5.cs illustrates the use of a DataView object to
filter and sort rows
*/

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

public class Example23_5
{

public static void Main()
{

// formulate a string containing the details of the
// database connection
string connectionString =
“server=localhost;database=Northwind;uid=sa;pwd=sa”;

// create a SqlConnection object to connect to the
// database, passing the connection string to the constructor
SqlConnection mySqlConnection =
new SqlConnection(connectionString);

// formulate a string containing a SELECT statement
string selectString =
“SELECT CustomerID, CompanyName, City, Country ” +
“FROM Customers”;

// create a SqlCommand object to hold the SELECT statement
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();

// set the CommandText property of the SqlCommand object to
// the SELECT string
mySqlCommand.CommandText = selectString;

// create a SqlDataAdapter object
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();

// set the SelectCommand property of the SqlAdapter object
// to the SqlCommand object
mySqlDataAdapter.SelectCommand = mySqlCommand;

// create a DataSet object to store the results of
// the SELECT statement
DataSet myDataSet = new DataSet();

// open the database connection using the
// Open() method of the SqlConnection object
mySqlConnection.Open();

// use the Fill() method of the SqlDataAdapter object to
// retrieve the rows from the table, storing the rows locally
// in a DataTable of the DataSet object
Console.WriteLine(“Retrieving rows from the Customers table”);
mySqlDataAdapter.Fill(myDataSet, “Customers”);

// create a DataView object
DataView myDataView =
new DataView(myDataSet.Tables[“Customers”]);

// set the RowFilter property of the DataView object
myDataView.RowFilter = “Country = 'UK'”;

// set the Sort property of the DataView object
myDataView.Sort = “CustomerID ASC”;

// display the rows in the DataView object
foreach (DataRowView myDataRowView in myDataView)
{
for (int count = 0; count < myDataView.Table.Columns.Count; count++) { Console.WriteLine(myDataRowView[count]); } } // close the database connection using the Close() method // of the SqlConnection object mySqlConnection.Close(); } } [/csharp]

   


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

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

    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.CommandText = "SELECT ID AS MappedID, FirstName, LastName " +
      "FROM Employee AS Emp " +
      "WHERE ID = 9";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Employee");
    mySqlConnection.Close();

    DataTableMapping myDataTableMapping = mySqlDataAdapter.TableMappings.Add("Employee", "Emp");

    myDataSet.Tables["Employee"].TableName = "Emp";

    Console.WriteLine("myDataTableMapping.DataSetTable = " + myDataTableMapping.DataSetTable);
    Console.WriteLine("myDataTableMapping.SourceTable = " + myDataTableMapping.SourceTable);

    myDataTableMapping.ColumnMappings.Add("ID", "MappedID");

    DataTable myDataTable = myDataSet.Tables["Emp"];
    foreach (DataRow myDataRow in myDataTable.Rows)
    {
      Console.WriteLine("ID = " + myDataRow["MappedID"]);
      Console.WriteLine("FirstName = " + myDataRow["FirstName"]);
      Console.WriteLine("LastName = " + myDataRow["LastName"]);
    }
  }
}
           
          

///////////////////////////////////////////////////////////////////////////////////////////////
//
// This File is Part of the CallButler Open Source PBX (http://www.codeplex.com/callbutler
//
// Copyright (c) 2005-2008, Jim Heising
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
//
// * Neither the name of Jim Heising nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

namespace WOSI.Utilities
{
public class DataUtils
{
public static DataRow CreateRowCopy(DataTable newParentTable, DataRow dataRow)
{
DataRow newRow = newParentTable.NewRow();

for (int index = 0; index < dataRow.Table.Columns.Count; index++) { newRow[index] = dataRow[index]; } return newRow; } public static void MoveDataRowUp(DataRow dataRow) { DataTable parentTable = dataRow.Table; int rowIndex = parentTable.Rows.IndexOf(dataRow); if (rowIndex > 0)
{
DataRow newDataRow = parentTable.NewRow();

for (int index = 0; index < dataRow.ItemArray.Length; index++) { newDataRow[index] = dataRow[index]; } parentTable.Rows.Remove(dataRow); parentTable.Rows.InsertAt(newDataRow, rowIndex - 1); dataRow = newDataRow; } } public static void MoveDataRowDown(DataRow dataRow) { DataTable parentTable = dataRow.Table; int rowIndex = parentTable.Rows.IndexOf(dataRow); if (rowIndex < parentTable.Rows.Count - 1) { DataRow newDataRow = parentTable.NewRow(); for (int index = 0; index < dataRow.ItemArray.Length; index++) { newDataRow[index] = dataRow[index]; } parentTable.Rows.Remove(dataRow); parentTable.Rows.InsertAt(newDataRow, rowIndex + 1); dataRow = newDataRow; } } } } [/csharp]

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

   class ModifyDataTable
   {
      static void Main()
      {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql = @"select * from employee";

         SqlConnection conn = new SqlConnection(connString);

         try {
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand(sql, conn);

            DataSet ds = new DataSet();   
            da.Fill(ds, "employee");

            DataTable dt = ds.Tables["employee"];

            dt.Columns["firstname"].AllowDBNull = true;

            dt.Rows[0]["FirstName"] = "Joe";

            DataRow newRow = dt.NewRow();
            newRow["firstname"] = "Roy";
            newRow["lastname"] = "Beatty";
            dt.Rows.Add(newRow);

            foreach (DataRow row in dt.Rows)
            {
               Console.WriteLine("{0} {1}",
                  row["firstname"].ToString().PadRight(15),
                  row["lastname"].ToString().PadLeft(25));
            }
            
         } catch(Exception e) {

            Console.WriteLine("Error: " + e);

         } finally {

            conn.Close();

         }
      }  
   }


           
         
     

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

   class FilterSort
   {
      static void Main(string[] args)
      {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql1 = @"select * from employee;";

         string sql2 = @"select firstname, lastname from employee";

         string sql = sql1 + sql2;

         SqlConnection conn = new SqlConnection(connString);

         try {
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand(sql, conn);

            DataSet ds = new DataSet();
            da.Fill(ds, "employee");

            DataTableCollection dtc = ds.Tables;

            Console.WriteLine("Results from Customers table:");
            Console.WriteLine("FirstName".PadRight(20) + "LastName".PadLeft(23) + "
");

            string fl = "FirstName = 'Z'";
            string srt = "LastName asc";
            foreach (DataRow row in dtc["Employee"].Select(fl, srt))
            {
               Console.WriteLine(
                  "{0}	{1}", 
                  row["FirstName"].ToString().PadRight(25),
                  row["LastName"]);
            }

            Console.WriteLine("Results from Products table:");
            Console.WriteLine("FirstName".PadRight(20) + "LastName".PadLeft(21) + "
");

            foreach (DataRow row in dtc[1].Rows){
               Console.WriteLine("{0}	{1}", row["FirstName"].ToString().PadRight(25),
                  row["LastName"]);
            }
         } catch(Exception e) {
            Console.WriteLine("Error: " + e);
         } finally {
            conn.Close();
         }
      }
   }



           
         
     

   
 
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example23_6.cs illustrates how to specify and use a
  relationship between two DataTable objects
*/

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

public class Example23_6
{

  public static void Main()
  {

    // formulate a string containing the details of the
    // database connection
    string connectionString =
      "server=localhost;database=Northwind;uid=sa;pwd=sa";

    // create a SqlConnection object to connect to the
    // database, passing the connection string to the constructor
    SqlConnection mySqlConnection =
      new SqlConnection(connectionString);

    // formulate a string containing a SELECT statement to
    // retrieve a row from the Customers table
    string selectString =
      "SELECT CustomerID, CompanyName " +
      "FROM Customers " +
      "WHERE CustomerID = 'ALFKI'";

    // create a SqlCommand object to hold the SELECT statement
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();

    // set the CommandText property of the SqlCommand object to
    // the SELECT string
    mySqlCommand.CommandText = selectString;

    // create a SqlDataAdapter object
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();

    // set the SelectCommand property of the SqlAdapter object
    // to the SqlCommand object
    mySqlDataAdapter.SelectCommand = mySqlCommand;

    // create a DataSet object to store the results of
    // the SELECT statement
    DataSet myDataSet = new DataSet();

    // open the database connection using the
    // Open() method of the SqlConnection object
    mySqlConnection.Open();

    // use the Fill() method of the SqlDataAdapter object to
    // retrieve the rows from the database, storing the rows
    // in a DataTable named "Customers"
    mySqlDataAdapter.Fill(myDataSet, "Customers");

    // formulate a string containing a SELECT statement to
    // retrieve the rows from the Orders table where the CustomerID
    // column is equal to ALFKI
    selectString =
      "SELECT OrderID, CustomerID " +
      "FROM Orders " +
      "WHERE CustomerID = 'ALFKI'";

    // set the CommandText property of the SqlCommand object to
    // the SELECT string
    mySqlCommand.CommandText = selectString;

    // use the Fill() method of the SqlDataAdapter object to
    // retrieve the rows from the database, storing the rows
    // in a DataTable named "Orders"
    mySqlDataAdapter.Fill(myDataSet, "Orders");

    // use the Add() method through the Relations property
    // to define a relationship between the Customers and
    // Orders DataTable objects
    myDataSet.Relations.Add(
      "Orders",
      myDataSet.Tables["Customers"].Columns["CustomerID"],
      myDataSet.Tables["Orders"].Columns["CustomerID"]
    );

    // display the rows in the Customers and Orders DataTable objects,
    // using the GetChildRows() method to get the orders for the
    // customer
    DataTable customers = myDataSet.Tables["Customers"];
    foreach (DataRow customer in customers.Rows)
    {
      Console.WriteLine("CustomerID = " + customer["CustomerID"]);
      Console.WriteLine("CompanyName = " + customer["CompanyName"]);

      DataRow[] orders = customer.GetChildRows("Orders");
      Console.WriteLine("This customer placed the following orders:");
      foreach (DataRow order in orders)
      {
        Console.WriteLine("  OrderID = " + order["OrderID"]);
      }

    }

    // close the database connection using the Close() method
    // of the SqlConnection object
    mySqlConnection.Close();

  }

}